Setting #FullScreen = True - #IncludeTitle = False seems to show a "full screen B4XPage" (although I have to "remove" the rounded corners of Root some way, since: Root.SetColorAndBorder(Root.Color, 0, xui.Color_Transparent, 0)
it's not enough).
What is the top part with the left arrow, title and 3 dots menu? Reading the source code of B4XPages.b4xlib it seem to be only the Activity.Title (in b4a)