https://learn.microsoft.com/zh-tw/windows/windows-app-sdk/api/winrt/microsoft.ui.xaml.frameworkelement.arrangeoverride?view=windows-app-sdk-1.8
FrameworkElement.ArrangeOverride(Size) Method (Microsoft.UI.Xaml) - Windows App SDK | Microsoft...
Provides the behavior for the "Arrange" pass of layout. Classes can override this method to define their own "Arrange" pass behavior.
windows appsizemethodmicrosoftui