Mobile Device: How to get fullscreen?

Hi, my program is starting at a Fullscreen, but when you should type in a text field the menu pops up and will not go back down. Here the normal screen how it should be.

By clicking into the text field the typing pad opens with the menu

By entering the name the menu stays. Also when you switch the widget or removing it.

Is there a way per blueprint or console command to reset the screen to fullscreen ?
Info: this problem occurs on a nexus 4 because it has no real buttons.

Thanks in advance :slight_smile: