[Windows] Fix FlyoutPage ShouldShowToolbarButton when overridden to return false, still shows button in title bar

src/Controls/src/Core/Platform/Windows/Extensions/ToolbarExtensions.cs

@@ -35,6 +35,10 @@ public static void UpdateBackButton(this MauiToolbar platformToolbar, Toolbar to
 			platformToolbar.IsBackEnabled =
 				toolbar.BackButtonEnabled && toolbar.BackButtonVisible;
 
+			// Adjusts WinUI TogglePaneButton visibility based on DrawerToggleVisible setting.
+			if (platformToolbar.TogglePaneButton is not null)
+				platformToolbar.TogglePaneButton.Visibility = toolbar.DrawerToggleVisible ? UI.Xaml.Visibility.Visible : UI.Xaml.Visibility.Collapsed;
+
 			platformToolbar
 				.IsBackButtonVisible = (toolbar.BackButtonVisible) ? NavigationViewBackButtonVisible.Visible : NavigationViewBackButtonVisible.Collapsed;
 

src/Controls/tests/TestCases.HostApp/Issues/Issue24547.cs

@@ -0,0 +1,57 @@
+namespace Maui.Controls.Sample.Issues
+{
+	[Issue(IssueTracker.Github, 24547, "[Windows] FlyoutPage ShouldShowToolbarButton when overridden to return false, still shows button in title bar", PlatformAffected.UWP)]
+	public class Issue24547PopoverPage : FlyoutPage
+	{
+		public Issue24547PopoverPage()
+		{
+			FlyoutLayoutBehavior = FlyoutLayoutBehavior.Popover;
+
+			Flyout = new ContentPage
+			{
+				Title = "Flyout",
+				BackgroundColor = Colors.Red,
+				Content = new StackLayout
+				{
+					Children = {
+						new Label { Text = "Flyout" }
+					}
+				}
+			};
+
+			ContentPage contentPage = new ContentPage
+			{
+				BackgroundColor = Colors.Green,
+				Title = "Detail",
+				Content = new StackLayout
+				{
+					Children = 
+					{
+						CreateDetailButton()
+					}
+				}
+			};
+
+			Detail = new NavigationPage(contentPage);
+			Button button = new Button() { Text = "Menu", AutomationId = "MenuButton" };
+			button.Clicked += (s, e) => IsPresented = true;
+			NavigationPage.SetTitleView(contentPage, button);
+		}
+
+		private Button CreateDetailButton()
+		{
+			Button button = new Button
+			{
+				Text = "Detail",
+				AutomationId = "DetailButton"
+			};
+
+			return button;
+		}
+
+		public override bool ShouldShowToolbarButton()
+		{
+			return false;
+		}
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue24547.cs

@@ -0,0 +1,21 @@
+#if !MACCATALYST
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues;
+public class Issue24547: _IssuesUITest
+{
+    public Issue24547(TestDevice device) : base(device) { }
+
+    public override string Issue => "[Windows] FlyoutPage ShouldShowToolbarButton when overridden to return false, still shows button in title bar";
+
+	[Test]
+	[Category(UITestCategories.FlyoutPage)]
+	public void VerifyInitialToolbarButtonHidden()
+	{
+		App.WaitForElement("DetailButton");
+		VerifyScreenshot();
+	}
+}
+#endif