https://learn.microsoft.com/en-us/windows/winui/api/microsoft.ui.xaml.media.revealbrush.targettheme?view=winui-2.8
RevealBrush.TargetTheme Property (Microsoft.UI.Xaml.Media) - WinUI | Microsoft Learn
Important RevealBrush is available for use in the operating systems specified in the Requirements section. However, we do not recommend its use as it may be...
propertymicrosoftuixamlmedia