Showing GUI ontop of fullscreen?

[AtleastItried]

I have made a GUI:

Gui +AlwaysOnTop

I not only want it to be alwaysontop, but also always showing over fullscreen applications. In this case it works for Chrome Fullscreen, but if I try the same with Edge it doesn't appear anymore. How can I change this?

[swagfag]

U can't, this will only work for windowed borderless "full screen" applications

[AtleastItried]

U can't, this will only work for windowed borderless "full screen" applications

I see. Is there any good way to trasform a fullscreen window into windowed mode, but without making the UI change?

[poetbox]

use a timer to detect if your GUI is still keep active