https://learn.microsoft.com/en-us/uwp/api/windows.ui.xaml.controls.settingsflyout?view=winrt-28000&redirectedfrom=MSDN
SettingsFlyout Class (Windows.UI.Xaml.Controls) - Windows apps | Microsoft Learn
Note SettingsFlyout is not supported for use in Universal Windows Platform (UWP) app for Windows 10. Instead, use a Flyout. Note SettingsFlyout is supported...
classwindowsuixamlcontrols