These bots... sigh

I'm wondering if the answer is related to Window properties flags, modality and possibly visibility. I've read the docs but some of it is a little thin on the ground and I am unclear how these properties interact.

Can anyone suggest what's needed for my app to be:

standard iPad app, which means single window that's fullscreen, and single-window app on Windows and MacOS

I've been controlling whether my app is fullscreen by setting visibility: Window.FullScreen. I still want to have the option to set this or not set this. (Or a different way to start / go into / out of full screen mode for Windows & MacOS.)

You can check the status of component with its status property and the errorString() method.

But Qt.WA_TranslucentBackground is a widget attribute:
https://doc.qt.io/qt-5/qt.html#WidgetAttribute-enum
not a flag for a window:
https://doc.qt.io/qt-5/qt.html#WindowType-enum

Is this how we set attributes for QML? Seems counter intuitive.