Default screen

Not sure if this is in the right forum, but here’s the question.

I have 2 monitors connected. The one on the left is configured as the primary monitor in display configuration. When I open apps, they appear on the monitor on my right. As this is on a kvm with my server, it’s quite a hassle to switch over and move the app. Does anyone have any ideas on how to fix this short of disconnecting the second monitor altogether?