In full screen:
Using numeric keyboard:
[+] to zoom in
[-] to zoom out
[4] to move screen left
[6] to move screen right
[8] to move screen up
[2] to move screen down
[5] to reset
In windowed mode:
To select screensize:
- use numeric keyboard [+] and/or [-]
- or use mousewheel up/down
Then place screen where you want it with mouse-pointer