[Net11 Preview 6] WinUI: Document for CollectionViewHandler2 implementation

docs/user-interface/controls/collectionview/index.md

@@ -16,24 +16,41 @@ The following screenshot shows a <xref:Microsoft.Maui.Controls.CollectionView> t
 
 <xref:Microsoft.Maui.Controls.CollectionView> should be used for presenting lists of data that require scrolling or selection. A bindable layout can be used when the data to be displayed doesn't require scrolling or selection. For more information, see [BindableLayout](~/user-interface/layouts/bindablelayout.md).
 
-::: moniker range=">=net-maui-10.0"
+::: moniker range="net-maui-10.0 net-maui-11.0"
 
 > [!NOTE]
-> On iOS and Mac Catalyst, the optimized handlers that were optional in .NET 9 are the default handlers for <xref:Microsoft.Maui.Controls.CollectionView> in .NET 10, providing improved performance and stability.
+> `CollectionView` optimized handlers became default at different times per platform:
+>
+> | Platform | Availability before default | Default starting in |
+> | --- | --- | --- |
+> | iOS / Mac Catalyst | .NET 9 (optional) | .NET 10 |
+> | Windows | Not available before .NET 11 | .NET 11 |
+>
+> These optimized handlers provide improved stability and performance.
 
-## Revert to .NET 9 behavior
+## Revert to previous behavior
 
-We recommend using the new handler for <xref:Microsoft.Maui.Controls.CollectionView>, but if you want to opt-out of this behavior and revert back to the .NET 9 handler, you can use the code below in your `MauiProgram.cs`.
+We recommend using the new handler for <xref:Microsoft.Maui.Controls.CollectionView>, but if you want to opt out and revert to the previous handler behavior, you can use the code below in your `MauiProgram.cs`.
+
+Configure handlers in `MauiProgram.cs`:
 
 ```csharp
-#if IOS || MACCATALYST
+#if IOS || MACCATALYST || WINDOWS
 builder.ConfigureMauiHandlers(handlers =>
 {
     handlers.AddHandler<Microsoft.Maui.Controls.CollectionView, Microsoft.Maui.Controls.Handlers.Items.CollectionViewHandler>();
 });
 #endif
 ```
 
+On Windows, you can also use the `UseWindowsCollectionView2Handler` build property in your project file.
+
+```xml
+<PropertyGroup>
+ <UseWindowsCollectionView2Handler>false</UseWindowsCollectionView2Handler>
+</PropertyGroup>
+```
+
 ::: moniker-end
 
 ## CollectionView and ListView differences

docs/whats-new/dotnet-11.md

@@ -48,6 +48,18 @@ In .NET 11 Preview 4, the Android handlers for several core controls use Materia
 
 In .NET 11 Preview 5, the underlying Material 3 helper types (`MauiMaterialEditText`, `MauiMaterialDatePicker`, `MauiMaterialPicker`, `MauiMaterialTimePicker`, `MauiMaterialTextView`, `MauiMaterialSearchBarTextInputLayout`, `MaterialActivityIndicator`, and `MauiMaterialContextThemeWrapper`) are public so you can subclass them from your own handler customizations. For more information, see [GitHub PR #35323](https://github.com/dotnet/maui/pull/35323) and [Material 3](~/user-interface/material-design.md).
 
+### CollectionView v2 on Windows
+
+Starting in .NET 11 Preview 6, <xref:Microsoft.Maui.Controls.CollectionView> on Windows now uses optimized default handlers, providing improved performance and stability. For more information, see [GitHub PR #34600](https://github.com/dotnet/maui/pull/34600).
+
+If you need to revert to the previous handler, you can disable the CollectionView v2 handler by setting the `UseWindowsCollectionView2Handler` build property to `false` in your project file:
+
+```xml
+<PropertyGroup>
+  <UseWindowsCollectionView2Handler>false</UseWindowsCollectionView2Handler>
+</PropertyGroup>
+```
+
 ### BoxView Fill property
 
 :::moniker range=">=net-maui-11.0"