I use 4 1920*1200 monitors to view a RDP session. I log in and then undock. I have to then drag the screen around to try and get it to fit the 4 monitors.
Is there a simple way to just have the screen the correct size when I undock?
In the RDP session, you can start it in Undocked mode instead of using the embedded mode. Then under the Display tab have you tried to change the Screen Sizing mode (test Smart reconnect) and the Remote desktop size (try Full Screen).