How to remote desktop fullscreen RDP with just SOME of your multiple monitors

solution

Basically, you need to change or add the following options. The first three lines you can simply copy, but the fourth line, you should change to your own values. 

screen mode id:i:2
use multimon:i:1
span monitors:i:1
selectedmonitors:s:3,4

explanation:

  • screen mode id:i:2 -- i means integer: 2 means fullscreen mode
  • use multimon:i:1 -- the remote desktop session will use multiple montiors
  • span monitors:i:1 -- allow to use part of the monitors for remote desktop session
  • selectedmonitors:s:3,4 -- specify what monitors you want to use: the value 3,4 could be different from yours. run mstsc /l (l here is L in lowercase) to check your own monitor ids.

Reference