Originally Posted by tuuquy
I still need help
The easiest way:
In Settings, go to Rom Control -> Power Menu Options
Tick "Show Navigation Bar Toggle".
Then when you enter a game, long press the power button, and you'll see a navigation bar in the power menu. The leftmost button (that looks like a power button itself, a bit confusing) is actually an 'enable/disable' toggle. Click it to hide the nav bar when you enter a game. Click it again to reshow after the game.
# phone/model> HTC One X - EndeavorU
# phone/ROM> In-between ROMs
# phone/Kernel> Stock
# phone/Recovery> TWRP 18.104.22.168 Touch Recovery (Repacked with JB kernel)
# tablet/model> Asus Nexus 7 (2013) - 32GB LTE (deb)
# tablet/ROM> ParanoidAndroid (Android 4.4.2) / Ubuntu Touch (Experimental)
# tablet/Kernel> Stock
# tablet/Recovery> TWRP 22.214.171.124 Touch Recovery (MultiBoot Enabled!)