diff --git a/src/Controls/tests/TestCases.Mac.Tests/snapshots/mac/ShouldHideHeaderWhenTitleEmpty.png b/src/Controls/tests/TestCases.Mac.Tests/snapshots/mac/ShouldHideHeaderWhenTitleEmpty.png
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diff --git a/src/Controls/tests/TestCases.Mac.Tests/snapshots/mac/ShouldShowHeaderWhenTitleNotEmpty.png b/src/Controls/tests/TestCases.Mac.Tests/snapshots/mac/ShouldShowHeaderWhenTitleNotEmpty.png
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diff --git a/src/Controls/tests/TestCases.WinUI.Tests/snapshots/windows/ModalPageBackgroundShouldBeTransparent.png b/src/Controls/tests/TestCases.WinUI.Tests/snapshots/windows/ModalPageBackgroundShouldBeTransparent.png
index c6abfec6960e..9005f93ceea4 100644
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diff --git a/src/Controls/tests/TestCases.WinUI.Tests/snapshots/windows/ShouldHideHeaderWhenTitleEmpty.png b/src/Controls/tests/TestCases.WinUI.Tests/snapshots/windows/ShouldHideHeaderWhenTitleEmpty.png
index 322dfcff2aa9..2f8068d77c23 100644
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diff --git a/src/Controls/tests/TestCases.WinUI.Tests/snapshots/windows/ShouldShowHeaderWhenTitleNotEmpty.png b/src/Controls/tests/TestCases.WinUI.Tests/snapshots/windows/ShouldShowHeaderWhenTitleNotEmpty.png
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diff --git a/src/Core/src/Platform/Windows/RootNavigationView.cs b/src/Core/src/Platform/Windows/RootNavigationView.cs
index c43ccac44a68..2fd6397b0f3b 100644
--- a/src/Core/src/Platform/Windows/RootNavigationView.cs
+++ b/src/Core/src/Platform/Windows/RootNavigationView.cs
@@ -68,6 +68,17 @@ internal Size FlyoutPaneSize
 
 		void PaneDisplayModeChanged(DependencyObject sender, DependencyProperty dp)
 		{
+			// AlwaysShowHeader must be false only in LeftMinimal mode (Shell flyout) so that
+			// CollapseEmptyHeader() can remove the header space when title/items are empty.
+			// All other modes (e.g. Left / FlyoutBehavior.Locked) keep AlwaysShowHeader=true
+			// so the header area remains visible regardless of content — restoring the
+			// original NavigationView behaviour and preventing the Issue2740 regression.
+			// Note: Top mode (TabbedPage) is safe with AlwaysShowHeader=true because
+			// UpdateToolbarPlacement() sets Header=null there, and WinUI's HeaderContent
+			// (a ContentControl) auto-collapses to zero height when its content is null.
+			// Additionally, UpdateHeaderPropertyBinding() binds HeaderContent.Visibility
+			// directly to Toolbar.Visibility, bypassing AlwaysShowHeader entirely.
+			AlwaysShowHeader = PaneDisplayMode != NavigationViewPaneDisplayMode.LeftMinimal;
 			UpdateToolbarPlacement();
 			UpdatePaneContentGridMargin();
 			UpdateHeaderVisibility();