Force an app to full-screen mode Is it possible to force an app into full-screen mode so all the soft-keys will disappear and the app will take up the entire screen areas?
i hope your device is rooted to do so, you can disable them quite easily.

Open the File Manager App, then tap the Menu button (capacitative or onscreen), and tap Settings.
Go to General Settings, scroll down to and tap Access Mode
Switch to either "Prompt User Mode" or "Root Access Mode"
Then 
Open the sec_touchkey.kl file in ./system/usr/keylayout/

Put a # symbol before the both the following lines:

key 139 MENU VIRTUAL
key 158 BACK VIRTUAL

Close, saving changes
Reboot

OR else if you dont want to root then go and download apps similar to https://play.google.com/store/apps/details?id=com.gmd.immersive&amp;hl=en