There might be a way to customize the title bar in B4XPages. You can certainly can add Menu Items.
But I haven't found any method for selectively removing the Back Arrow.
I can do it, but only by replacing the Title Bar with my own Panel which contains the pieces I want.
I set #IncludeTitle: False (in Main), then add the custom panel when the page is created..
Since it is custom, you can easily manipulate the visibility property of the Back Arrow Icon in a label in the panel.
True, if you already have Menu Items, you have to add them to you Custom header panel.
Others may have better ways.