Originally Posted by ATRIXXIRTA
You can only add that to a custom rom, or to a stock rom with Xposed module installed.
In either case you would need to be bootloader unlocked and rooted.
The apps themselves are supposed to have a 3-dot "overflow" menu.
Not all apps have been optimized for kitkats immersive mode
Thought that might be the case
Alot of my girlfriends apps are not kit kat optimised.