go to SETTINGS - MOTION CONTROL - MORE & disable One-hand UI
Enable/Disable One-hand UI is available in the shortcut panel menu also..
I had the same problem, I solved it
Re: Keyboard is not full screen anymore (Huawei P7)
If you have not solved it, try this:
go to SETTINGS - MOTION CONTROL - MORE & disable One-Hand UI
Enable/Disable One-hand UI is available in the shortcut panel menu also..
Enjoy !