https://learn.microsoft.com/en-us/windows/winui/api/microsoft.ui.xaml.controls.menubaritem.titleproperty?view=winui-2.8
MenuBarItem.TitleProperty Property (Microsoft.UI.Xaml.Controls) - WinUI | Microsoft Learn
Identifies the Title dependency property. This documentation applies to WinUI 2 for UWP (for WinUI in the Windows App SDK, see the Windows App SDK namespaces).
propertymicrosoftuixamlcontrols