Screen on left top only (Photo included)

[chailifoo]

I need help here.

I run Ubuntu 16 live on two PC.
But both screen appear on left top only.
What can i do to make the screen fit the monitor.

http://imageshack.com/a/img923/995/QH2Hze.jpg

[wildmanne39]

Please use thumbnails or Url's when posting images because many people have slow internet connections or limited band width.