https://learn.microsoft.com/en-us/uwp/api/windows.ui.xaml.media.animation.splitopenthemeanimation?view=winrt-28000&redirectedfrom=MSDN
SplitOpenThemeAnimation Class (Windows.UI.Xaml.Media.Animation) - Windows apps | Microsoft Learn
Represents the preconfigured animation that reveals a target UI using a split animation.
media animationclasswindowsuixaml