diff --git a/dev/integration_tests/flutter_gallery/test/demo/cupertino/cupertino_navigation_demo_test.dart b/dev/integration_tests/flutter_gallery/test/demo/cupertino/cupertino_navigation_demo_test.dart
index 2bd4049c8a4..3196ebcff30 100644
--- a/dev/integration_tests/flutter_gallery/test/demo/cupertino/cupertino_navigation_demo_test.dart
+++ b/dev/integration_tests/flutter_gallery/test/demo/cupertino/cupertino_navigation_demo_test.dart
@@ -12,6 +12,10 @@ void main() {
     // The point is to mainly test the cupertino icons that we don't have a
     // dependency against in the flutter/cupertino package directly.
 
+    // Set window orientation to portrait.
+    tester.view.physicalSize = const Size(2400.0, 3000.0);
+    addTearDown(tester.view.reset);
+
     final Future<ByteData> font = rootBundle.load(
       'packages/cupertino_icons/assets/CupertinoIcons.ttf',
     );
diff --git a/examples/api/test/cupertino/nav_bar/cupertino_sliver_nav_bar.0_test.dart b/examples/api/test/cupertino/nav_bar/cupertino_sliver_nav_bar.0_test.dart
index 589a7a0d496..e31796241c1 100644
--- a/examples/api/test/cupertino/nav_bar/cupertino_sliver_nav_bar.0_test.dart
+++ b/examples/api/test/cupertino/nav_bar/cupertino_sliver_nav_bar.0_test.dart
@@ -8,10 +8,16 @@ import 'package:flutter_test/flutter_test.dart';
 
 const Offset dragUp = Offset(0.0, -150.0);
 
+void setWindowToPortrait(WidgetTester tester, {Size size = const Size(2400.0, 3000.0)}) {
+  tester.view.physicalSize = size;
+  addTearDown(tester.view.reset);
+}
+
 void main() {
   testWidgets('Collapse and expand CupertinoSliverNavigationBar changes title position', (
     WidgetTester tester,
   ) async {
+    setWindowToPortrait(tester);
     await tester.pumpWidget(const example.SliverNavBarApp());
 
     // Large title is visible and at lower position.
@@ -29,6 +35,7 @@ void main() {
   testWidgets('Middle widget is visible in both collapsed and expanded states', (
     WidgetTester tester,
   ) async {
+    setWindowToPortrait(tester);
     await tester.pumpWidget(const example.SliverNavBarApp());
 
     // Navigate to a page that has both middle and large titles.
@@ -55,6 +62,7 @@ void main() {
   testWidgets('CupertinoSliverNavigationBar with previous route has back button', (
     WidgetTester tester,
   ) async {
+    setWindowToPortrait(tester);
     await tester.pumpWidget(const example.SliverNavBarApp());
 
     // Navigate to a page that has back button
diff --git a/examples/api/test/cupertino/nav_bar/cupertino_sliver_nav_bar.1_test.dart b/examples/api/test/cupertino/nav_bar/cupertino_sliver_nav_bar.1_test.dart
index 25caf27d40a..e65a128a821 100644
--- a/examples/api/test/cupertino/nav_bar/cupertino_sliver_nav_bar.1_test.dart
+++ b/examples/api/test/cupertino/nav_bar/cupertino_sliver_nav_bar.1_test.dart
@@ -9,10 +9,16 @@ import 'package:flutter_test/flutter_test.dart';
 const Offset titleDragUp = Offset(0.0, -100.0);
 const Offset bottomDragUp = Offset(0.0, -50.0);
 
+void setWindowToPortrait(WidgetTester tester, {Size size = const Size(2400.0, 3000.0)}) {
+  tester.view.physicalSize = size;
+  addTearDown(tester.view.reset);
+}
+
 void main() {
   testWidgets('Collapse and expand CupertinoSliverNavigationBar changes title position', (
     WidgetTester tester,
   ) async {
+    setWindowToPortrait(tester);
     await tester.pumpWidget(const example.SliverNavBarApp());
 
     // Large title is visible and at lower position.
@@ -28,6 +34,7 @@ void main() {
   });
 
   testWidgets('Search field is hidden in bottom automatic mode', (WidgetTester tester) async {
+    setWindowToPortrait(tester);
     await tester.pumpWidget(const example.SliverNavBarApp());
 
     // Navigate to a page with bottom automatic mode.
@@ -64,6 +71,7 @@ void main() {
   });
 
   testWidgets('Search field is always shown in bottom always mode', (WidgetTester tester) async {
+    setWindowToPortrait(tester);
     await tester.pumpWidget(const example.SliverNavBarApp());
 
     // Navigate to a page with bottom always mode.
@@ -92,6 +100,7 @@ void main() {
   });
 
   testWidgets('Opens the search view when the search field is tapped', (WidgetTester tester) async {
+    setWindowToPortrait(tester);
     await tester.pumpWidget(const example.SliverNavBarApp());
 
     // Navigate to a page with a search field.
@@ -131,6 +140,7 @@ void main() {
   testWidgets('CupertinoSliverNavigationBar with previous route has back button', (
     WidgetTester tester,
   ) async {
+    setWindowToPortrait(tester);
     await tester.pumpWidget(const example.SliverNavBarApp());
 
     // Navigate to the first page.
diff --git a/examples/api/test/cupertino/nav_bar/cupertino_sliver_nav_bar.2_test.dart b/examples/api/test/cupertino/nav_bar/cupertino_sliver_nav_bar.2_test.dart
index 3650887671a..4477383a262 100644
--- a/examples/api/test/cupertino/nav_bar/cupertino_sliver_nav_bar.2_test.dart
+++ b/examples/api/test/cupertino/nav_bar/cupertino_sliver_nav_bar.2_test.dart
@@ -8,8 +8,14 @@ import 'package:flutter_test/flutter_test.dart';
 
 const Offset dragUp = Offset(0.0, -150.0);
 
+void setWindowToPortrait(WidgetTester tester, {Size size = const Size(2400.0, 3000.0)}) {
+  tester.view.physicalSize = size;
+  addTearDown(tester.view.reset);
+}
+
 void main() {
   testWidgets('CupertinoSliverNavigationBar bottom widget', (WidgetTester tester) async {
+    setWindowToPortrait(tester);
     await tester.pumpWidget(const example.SliverNavBarApp());
 
     final Finder preferredSize = find.byType(PreferredSize);
@@ -24,6 +30,7 @@ void main() {
   testWidgets('Collapse and expand CupertinoSliverNavigationBar changes title position', (
     WidgetTester tester,
   ) async {
+    setWindowToPortrait(tester);
     await tester.pumpWidget(const example.SliverNavBarApp());
 
     // Large title is visible and at lower position.
@@ -41,6 +48,7 @@ void main() {
   testWidgets('Middle widget is visible in both collapsed and expanded states', (
     WidgetTester tester,
   ) async {
+    setWindowToPortrait(tester);
     await tester.pumpWidget(const example.SliverNavBarApp());
 
     // Navigate to a page that has both middle and large titles.
@@ -67,6 +75,7 @@ void main() {
   testWidgets('CupertinoSliverNavigationBar with previous route has back button', (
     WidgetTester tester,
   ) async {
+    setWindowToPortrait(tester);
     await tester.pumpWidget(const example.SliverNavBarApp());
 
     // Navigate to a page that has a back button.
diff --git a/packages/flutter/lib/src/cupertino/nav_bar.dart b/packages/flutter/lib/src/cupertino/nav_bar.dart
index a5621121532..d71314d1ff8 100644
--- a/packages/flutter/lib/src/cupertino/nav_bar.dart
+++ b/packages/flutter/lib/src/cupertino/nav_bar.dart
@@ -1149,11 +1149,13 @@ class _CupertinoSliverNavigationBarState extends State<CupertinoSliverNavigation
   late _NavigationBarStaticComponentsKeys keys;
   ScrollableState? _scrollableState;
   _NavigationBarSearchField? preferredSizeSearchField;
+  Widget? effectiveMiddle;
   late AnimationController _animationController;
   late CurvedAnimation _searchAnimation;
   late Animation<double> persistentHeightAnimation;
   late Animation<double> largeTitleHeightAnimation;
   bool searchIsActive = false;
+  bool isPortrait = true;
 
   @override
   void initState() {
@@ -1169,6 +1171,14 @@ class _CupertinoSliverNavigationBarState extends State<CupertinoSliverNavigation
   @override
   void didChangeDependencies() {
     super.didChangeDependencies();
+    isPortrait = MediaQuery.orientationOf(context) == Orientation.portrait;
+    final Tween<double> largeTitleHeightTween = Tween<double>(
+      begin: isPortrait ? _kNavBarLargeTitleHeightExtension : 0.0,
+      end: 0.0,
+    );
+    largeTitleHeightAnimation = largeTitleHeightTween.animate(_animationController);
+    effectiveMiddle = widget.middle ?? (isPortrait ? null : widget.largeTitle);
+
     _scrollableState?.position.isScrollingNotifier.removeListener(_handleScrollChange);
     _scrollableState = Scrollable.maybeOf(context);
     _scrollableState?.position.isScrollingNotifier.addListener(_handleScrollChange);
@@ -1203,11 +1213,6 @@ class _CupertinoSliverNavigationBarState extends State<CupertinoSliverNavigation
     );
     persistentHeightAnimation = persistentHeightTween.animate(_animationController)
       ..addStatusListener(_handleSearchFieldStatusChanged);
-    final Tween<double> largeTitleHeightTween = Tween<double>(
-      begin: _kNavBarLargeTitleHeightExtension,
-      end: 0.0,
-    );
-    largeTitleHeightAnimation = largeTitleHeightTween.animate(_animationController);
   }
 
   void _handleScrollChange() {
@@ -1221,16 +1226,17 @@ class _CupertinoSliverNavigationBarState extends State<CupertinoSliverNavigation
         widget.bottomMode == NavigationBarBottomMode.always ? 0.0 : _bottomHeight;
     final bool canScrollBottom =
         (widget._searchable || widget.bottom != null) && bottomScrollOffset > 0.0;
+    final double effectiveLargeTitleHeight = isPortrait ? _kNavBarLargeTitleHeightExtension : 0.0;
 
     // Snap the scroll view to a target determined by the navigation bar's
     // position.
     if (canScrollBottom && position.pixels < bottomScrollOffset) {
       target = position.pixels > bottomScrollOffset / 2 ? bottomScrollOffset : 0.0;
     } else if (position.pixels > bottomScrollOffset &&
-        position.pixels < bottomScrollOffset + _kNavBarLargeTitleHeightExtension) {
+        position.pixels < bottomScrollOffset + effectiveLargeTitleHeight) {
       target =
-          position.pixels > bottomScrollOffset + (_kNavBarLargeTitleHeightExtension / 2)
-              ? bottomScrollOffset + _kNavBarLargeTitleHeightExtension
+          position.pixels > bottomScrollOffset + (effectiveLargeTitleHeight / 2)
+              ? bottomScrollOffset + effectiveLargeTitleHeight
               : bottomScrollOffset;
     }
 
@@ -1280,7 +1286,7 @@ class _CupertinoSliverNavigationBarState extends State<CupertinoSliverNavigation
       automaticallyImplyLeading: widget.automaticallyImplyLeading,
       automaticallyImplyTitle: widget.automaticallyImplyTitle,
       previousPageTitle: widget.previousPageTitle,
-      userMiddle: _animationController.isAnimating ? const Text('') : widget.middle,
+      userMiddle: _animationController.isAnimating ? const Text('') : effectiveMiddle,
       userTrailing:
           widget.trailing != null
               ? Visibility(visible: !searchIsActive, child: widget.trailing!)
@@ -1304,7 +1310,7 @@ class _CupertinoSliverNavigationBarState extends State<CupertinoSliverNavigation
               : widget.bottom) ??
           const SizedBox.shrink(),
       padding: widget.padding,
-      large: true,
+      large: isPortrait,
       staticBar: false, // This one scrolls.
       context: context,
     );
@@ -1318,7 +1324,7 @@ class _CupertinoSliverNavigationBarState extends State<CupertinoSliverNavigation
             delegate: _LargeTitleNavigationBarSliverDelegate(
               keys: keys,
               components: components,
-              userMiddle: widget.middle,
+              userMiddle: effectiveMiddle,
               backgroundColor:
                   CupertinoDynamicColor.maybeResolve(widget.backgroundColor, context) ??
                   CupertinoTheme.of(context).barBackgroundColor,
@@ -1331,7 +1337,7 @@ class _CupertinoSliverNavigationBarState extends State<CupertinoSliverNavigation
               heroTag: widget.heroTag,
               persistentHeight: persistentHeightAnimation.value + MediaQuery.paddingOf(context).top,
               largeTitleHeight: largeTitleHeightAnimation.value,
-              alwaysShowMiddle: widget.alwaysShowMiddle && widget.middle != null,
+              alwaysShowMiddle: widget.alwaysShowMiddle && effectiveMiddle != null,
               stretchConfiguration:
                   widget.stretch && !searchIsActive ? OverScrollHeaderStretchConfiguration() : null,
               enableBackgroundFilterBlur: widget.enableBackgroundFilterBlur,
diff --git a/packages/flutter/test/cupertino/nav_bar_test.dart b/packages/flutter/test/cupertino/nav_bar_test.dart
index 6c16d5a3c71..5edce13274e 100644
--- a/packages/flutter/test/cupertino/nav_bar_test.dart
+++ b/packages/flutter/test/cupertino/nav_bar_test.dart
@@ -16,6 +16,11 @@ import '../widgets/semantics_tester.dart';
 
 int count = 0;
 
+void setWindowToPortrait(WidgetTester tester, {Size size = const Size(2400.0, 3000.0)}) {
+  tester.view.physicalSize = size;
+  addTearDown(tester.view.reset);
+}
+
 void main() {
   testWidgets('Middle still in center with asymmetrical actions', (WidgetTester tester) async {
     await tester.pumpWidget(
@@ -305,6 +310,7 @@ void main() {
   });
 
   testWidgets('Can specify custom brightness', (WidgetTester tester) async {
+    setWindowToPortrait(tester);
     await tester.pumpWidget(
       const CupertinoApp(
         home: CupertinoNavigationBar(
@@ -498,6 +504,7 @@ void main() {
   });
 
   testWidgets('Large title nav bar scrolls', (WidgetTester tester) async {
+    setWindowToPortrait(tester);
     final ScrollController scrollController = ScrollController();
     addTearDown(scrollController.dispose);
     await tester.pumpWidget(
@@ -573,6 +580,7 @@ void main() {
   });
 
   testWidgets('User specified middle is always visible in sliver', (WidgetTester tester) async {
+    setWindowToPortrait(tester);
     final ScrollController scrollController = ScrollController();
     addTearDown(scrollController.dispose);
     final Key segmentedControlsKey = UniqueKey();
@@ -629,6 +637,7 @@ void main() {
   testWidgets(
     'User specified middle is only visible when sliver is collapsed if alwaysShowMiddle is false',
     (WidgetTester tester) async {
+      setWindowToPortrait(tester);
       final ScrollController scrollController = ScrollController();
       addTearDown(scrollController.dispose);
       await tester.pumpWidget(
@@ -682,6 +691,7 @@ void main() {
   );
 
   testWidgets('Small title can be overridden', (WidgetTester tester) async {
+    setWindowToPortrait(tester);
     final ScrollController scrollController = ScrollController();
     addTearDown(scrollController.dispose);
     await tester.pumpWidget(
@@ -1171,6 +1181,7 @@ void main() {
   });
 
   testWidgets('Sliver large title golden', (WidgetTester tester) async {
+    setWindowToPortrait(tester);
     await tester.pumpWidget(
       CupertinoApp(
         home: RepaintBoundary(
@@ -1736,6 +1747,7 @@ void main() {
     (WidgetTester tester) async {
       const Text trailingText = Text('Bar Button');
       const Text titleText = Text('Large Title');
+      setWindowToPortrait(tester);
 
       await tester.pumpWidget(
         CupertinoApp(
@@ -1874,6 +1886,7 @@ void main() {
   testWidgets(
     'CupertinoSliverNavigationBar magnifies upon over-scroll and shrinks back once over-scroll ends',
     (WidgetTester tester) async {
+      setWindowToPortrait(tester);
       const Text titleText = Text('Large Title');
 
       await tester.pumpWidget(
@@ -1985,6 +1998,7 @@ void main() {
     const double largeTitleHeight = 44.0;
     const double bottomHeight = 10.0;
     final ScrollController controller = ScrollController();
+    setWindowToPortrait(tester);
 
     await tester.pumpWidget(
       CupertinoApp(
@@ -2042,6 +2056,7 @@ void main() {
     const double persistentHeight = 44.0;
     const double largeTitleHeight = 44.0;
     const double bottomHeight = 10.0;
+    setWindowToPortrait(tester);
 
     await tester.pumpWidget(
       CupertinoApp(
@@ -2119,6 +2134,7 @@ void main() {
   ) async {
     const double bottomHeight = 10.0;
     const double bottomDisplacement = 96.0;
+    setWindowToPortrait(tester);
 
     await tester.pumpWidget(
       CupertinoApp(
@@ -2166,6 +2182,7 @@ void main() {
       final ScrollController scrollController = ScrollController();
       addTearDown(scrollController.dispose);
       const double largeTitleHeight = 52.0;
+      setWindowToPortrait(tester);
 
       await tester.pumpWidget(
         CupertinoApp(
@@ -2212,6 +2229,7 @@ void main() {
       final ScrollController scrollController = ScrollController();
       addTearDown(scrollController.dispose);
       const double largeTitleHeight = 52.0;
+      setWindowToPortrait(tester);
 
       await tester.pumpWidget(
         CupertinoApp(
@@ -2258,6 +2276,7 @@ void main() {
       addTearDown(scrollController.dispose);
       const double largeTitleHeight = 52.0;
       const double bottomHeight = 100.0;
+      setWindowToPortrait(tester);
 
       await tester.pumpWidget(
         CupertinoApp(
@@ -2323,6 +2342,7 @@ void main() {
       addTearDown(scrollController.dispose);
       const double largeTitleHeight = 52.0;
       const double bottomHeight = 100.0;
+      setWindowToPortrait(tester);
 
       await tester.pumpWidget(
         CupertinoApp(
@@ -2392,6 +2412,7 @@ void main() {
       addTearDown(scrollController.dispose);
       const double largeTitleHeight = 52.0;
       const double bottomHeight = 100.0;
+      setWindowToPortrait(tester);
 
       await tester.pumpWidget(
         CupertinoApp(
@@ -2459,6 +2480,7 @@ void main() {
       final ScrollController scrollController = ScrollController();
       addTearDown(scrollController.dispose);
       const double largeTitleHeight = 52.0;
+      setWindowToPortrait(tester);
 
       await tester.pumpWidget(
         CupertinoApp(
@@ -2542,6 +2564,7 @@ void main() {
   testWidgets('CupertinoSliverNavigationBar.search field collapses nav bar on tap', (
     WidgetTester tester,
   ) async {
+    setWindowToPortrait(tester);
     await tester.pumpWidget(
       const CupertinoApp(
         home: CustomScrollView(
@@ -2609,8 +2632,7 @@ void main() {
   });
 
   testWidgets('CupertinoSliverNavigationBar.search golden tests', (WidgetTester tester) async {
-    await tester.binding.setSurfaceSize(const Size(390, 850));
-    addTearDown(() => tester.binding.setSurfaceSize(null));
+    setWindowToPortrait(tester);
     await tester.pumpWidget(
       const CupertinoApp(
         home: RepaintBoundary(
@@ -2672,6 +2694,7 @@ void main() {
   });
 
   testWidgets('onSearchableBottomTap callback', (WidgetTester tester) async {
+    setWindowToPortrait(tester);
     const Color activeSearchColor = Color(0x0000000A);
     const Color inactiveSearchColor = Color(0x0000000B);
     bool isSearchActive = false;
@@ -2750,6 +2773,7 @@ void main() {
   testWidgets(
     'CupertinoSliverNavigationBar.search large title and cancel buttons fade during search animation',
     (WidgetTester tester) async {
+      setWindowToPortrait(tester);
       await tester.pumpWidget(
         const CupertinoApp(
           home: CustomScrollView(
@@ -2826,6 +2850,52 @@ void main() {
       expect(cancelOpacity.opacity.value, 0.0);
     },
   );
+
+  testWidgets('Large title is hidden if middle is provided in landscape mode', (
+    WidgetTester tester,
+  ) async {
+    const String largeTitle = 'Large title';
+    const String middle = 'Middle';
+    await tester.pumpWidget(
+      const CupertinoApp(
+        home: CustomScrollView(
+          slivers: <Widget>[
+            CupertinoSliverNavigationBar.search(
+              largeTitle: Text(largeTitle),
+              middle: Text(middle),
+              searchField: CupertinoSearchTextField(),
+            ),
+            SliverFillRemaining(child: SizedBox(height: 1000.0)),
+          ],
+        ),
+      ),
+    );
+
+    expect(find.text(largeTitle), findsNothing);
+    expect(find.text(middle), findsOneWidget);
+    expect(find.byType(CupertinoSearchTextField), findsOneWidget);
+  });
+
+  testWidgets('Large title is shown in middle position in landscape mode', (
+    WidgetTester tester,
+  ) async {
+    const String largeTitle = 'Large title';
+    await tester.pumpWidget(
+      const CupertinoApp(
+        home: CustomScrollView(
+          slivers: <Widget>[
+            CupertinoSliverNavigationBar.search(
+              largeTitle: Text(largeTitle),
+              searchField: CupertinoSearchTextField(),
+            ),
+            SliverFillRemaining(child: SizedBox(height: 1000.0)),
+          ],
+        ),
+      ),
+    );
+    expect(find.text(largeTitle), findsOneWidget);
+    expect(find.byType(CupertinoSearchTextField), findsOneWidget);
+  });
 }
 
 class _ExpectStyles extends StatelessWidget {
diff --git a/packages/flutter/test/cupertino/nav_bar_transition_test.dart b/packages/flutter/test/cupertino/nav_bar_transition_test.dart
index 97c67dda8b0..cb79d112d2f 100644
--- a/packages/flutter/test/cupertino/nav_bar_transition_test.dart
+++ b/packages/flutter/test/cupertino/nav_bar_transition_test.dart
@@ -132,6 +132,11 @@ void checkOpacity(WidgetTester tester, Finder finder, double opacity) {
   );
 }
 
+void setWindowToPortrait(WidgetTester tester, {Size size = const Size(2400.0, 3000.0)}) {
+  tester.view.physicalSize = size;
+  addTearDown(tester.view.reset);
+}
+
 void main() {
   testWidgets('Bottom middle moves between middle and back label', (WidgetTester tester) async {
     await startTransitionBetween(tester, fromTitle: 'Page 1');
@@ -666,6 +671,7 @@ void main() {
   testWidgets('Middle is not shown if alwaysShowMiddle is false and the nav bar is expanded', (
     WidgetTester tester,
   ) async {
+    setWindowToPortrait(tester);
     const Widget userMiddle = Placeholder();
     await startTransitionBetween(
       tester,
@@ -987,6 +993,7 @@ void main() {
   });
 
   testWidgets('Bottom large title moves to top back label', (WidgetTester tester) async {
+    setWindowToPortrait(tester);
     await startTransitionBetween(
       tester,
       from: const CupertinoSliverNavigationBar(),
@@ -1045,6 +1052,7 @@ void main() {
   testWidgets('Bottom CupertinoSliverNavigationBar.bottom fades and slides out from the left', (
     WidgetTester tester,
   ) async {
+    setWindowToPortrait(tester);
     await startTransitionBetween(
       tester,
       from: const CupertinoSliverNavigationBar(
@@ -1081,6 +1089,7 @@ void main() {
   testWidgets('Bottom CupertinoNavigationBar.bottom fades and slides out from the left', (
     WidgetTester tester,
   ) async {
+    setWindowToPortrait(tester);
     await startTransitionBetween(
       tester,
       from: const CupertinoNavigationBar(
@@ -1117,6 +1126,7 @@ void main() {
   testWidgets(
     'CupertinoSliverNavigationBar.bottom clips its contents mid-transition when scrolled',
     (WidgetTester tester) async {
+      setWindowToPortrait(tester);
       await tester.pumpWidget(
         CupertinoApp(
           builder: (BuildContext context, Widget? navigator) {
@@ -1233,6 +1243,7 @@ void main() {
   );
 
   testWidgets('Long title turns into the word back mid transition', (WidgetTester tester) async {
+    setWindowToPortrait(tester);
     await startTransitionBetween(
       tester,
       from: const CupertinoSliverNavigationBar(),
@@ -1289,6 +1300,7 @@ void main() {
   testWidgets('Bottom large title and top back label transitions their font', (
     WidgetTester tester,
   ) async {
+    setWindowToPortrait(tester);
     await startTransitionBetween(
       tester,
       from: const CupertinoSliverNavigationBar(),
@@ -1397,6 +1409,7 @@ void main() {
   });
 
   testWidgets('Top large title fades in and slides in from the right', (WidgetTester tester) async {
+    setWindowToPortrait(tester);
     await startTransitionBetween(
       tester,
       to: const CupertinoSliverNavigationBar(),
@@ -1427,6 +1440,7 @@ void main() {
   testWidgets('Top large title fades in and slides in from the left in RTL', (
     WidgetTester tester,
   ) async {
+    setWindowToPortrait(tester);
     await startTransitionBetween(
       tester,
       to: const CupertinoSliverNavigationBar(),
@@ -1460,6 +1474,7 @@ void main() {
   ) async {
     const double horizontalPadding = 16.0; // _kNavBarEdgePadding
     const double height = 30.0;
+    setWindowToPortrait(tester);
     await startTransitionBetween(
       tester,
       toTitle: 'Page 2',
@@ -1503,7 +1518,7 @@ void main() {
     // The nav bar bottom is horizontally aligned to the large title.
     expect(
       tester.getTopLeft(flying(tester, find.byType(Placeholder))).dx,
-      largeTitleOffset.dx - horizontalPadding,
+      moreOrLessEquals(largeTitleOffset.dx - horizontalPadding, epsilon: 0.01),
     );
   });
 
@@ -1581,6 +1596,7 @@ void main() {
   ) async {
     int bottomBuildTimes = 0;
     int topBuildTimes = 0;
+    setWindowToPortrait(tester);
     await startTransitionBetween(
       tester,
       from: CupertinoNavigationBar(
diff --git a/packages/flutter/test/cupertino/route_test.dart b/packages/flutter/test/cupertino/route_test.dart
index 534fcd9da02..520d540714f 100644
--- a/packages/flutter/test/cupertino/route_test.dart
+++ b/packages/flutter/test/cupertino/route_test.dart
@@ -51,6 +51,9 @@ void main() {
   });
 
   testWidgets('Large title auto-populates with title', (WidgetTester tester) async {
+    // Set window orientation to portrait.
+    tester.view.physicalSize = const Size(2400.0, 3000.0);
+    addTearDown(tester.view.reset);
     await tester.pumpWidget(const CupertinoApp(home: Placeholder()));
 
     tester