I want to put the app in full screen, more than only hide the statut bar.
Do you know any methods if they exist ?
Check the Screen1 Attributes for a couple of check boxes you can turn off.
Yes I did, but even with all off, there is still a black bar on top of the screen.
Do you think it depends of the model of the phone ?
including this one?
All off : TitleVisible is off, ShowStatusBar is off, ShowListAsJason too ...
I think it's maybe because my front camera is in the middle of the top of the screen but I don't believe in it.
So any ideas ?
Ah yes, newer phones with the front camera "in the screen" require a bit more work. You may need an extension that handles this, even then, there is often some strange behaviour displayed....
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Try the tools extension and its HideSystemUI method, see also the example project there
Taifun
Doesn't work, like @TIMAI2 said it's cause of newer phones 
The extension can change the screen parameters but not go over the problem