At work I have one monitor in landscape and 1 in portrait.
At home I have the same.
When I try to log on from home, I get the main monitor when I log in. Then I hold down shift and maximize the screen. The main monitor (landscape) is fine but the second portrait monitor is cut off about 2/3 the way down and shows my cleints screen in that area.
Any suggestions to get the full screen on the second monitor?
My office set up is
#2monitor in Landscape #1 monitor in portrait #3 monitor in portrait (set to mirror #1)
Home set up
#1 monitor in landscape #2 monitor in portrait
All resolutions are same 1080 x 1920 for landscape and 1920 x 1080 portrait.
If both monitor setups are identical at both ends, then you should be able to maximize to mirror the Host onto the Client in full screen. I would try to visit your client PC manufacturer's website to see if there are any video driver updates available. After that, you can create a case with Customer Support by telephone so we may fully document both environments and escalate if needed.