remove rqt left corner 'x - []' icons

edit

I plan to use rqt on a raspberry touch panel which is apparently smaller than a pc. I'd like to realize two modifications, 1) Let the rqt automatically fit to the size of the raspberry screen once launched from terminal. 2) Given that a launch file is used to start the rqt and fill it to the size of the screen, I want to remove the icons 'close, minimize and maximize' on the left corner of rqt because they look redundent to these simliar icons on the raspberry display.