Unable to login & GUI is too large (maybe the phone screen size problem?)

Problem 1 :
Unable to login to XBox account on android 4.2.2. The login GUI always closed after loading and changing to main menu.

Why ? Maybe this Android version is not supported for
some requirements that make you can login to XBox,

Step to reproduce
Upgrade your device Android OS to 4.4.2.
Or use BLauncher. Trust me, it'll work!
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Problem 2:
When i make GUI scale to largest, because item is too small is in medium GUI scale, the button on title screen and Game Menu become higher than my device screen.

Step to reproduce:
Change the GUI scale to medium, if you want medium button and smaller item's icon.
Apologize me if this is my fault.

My Device: ALPS ZeusPhone ZP-451, 512 MB RAM, 1GB ROM, 4,5" screen.
Sorry if the language is not easily understood.