HMD Android small screen in big frames

Hi! Getting tired of unity i found that UE now can do cardboard. Yaaay!

Quickly get a project and everything looks great except one thing:
HMD seems to give a huge frame around each eye, also the image is not cehtered due to comtrol buttons at the bottom of the screen. My device is LG G2. Searched a lot, but didn’t find a solution. Can anyone help?

why nobody answer this , i have same problem