Do you have headtracking? If yes, stop or pause it. Then hold down the RCtrl + RShft keys, and zoom in and out with the Num/and Num*, or Num- keys depending on your keyboard layout. To go up/down/sideways use Num2, Num4, Num5 and Num8. When you're satisfied, you can save with RAlt + Num0. Cheers! Sent from my SM-A536B using Tapatalk