I have reported problems from time to time with my dual GPUs. I have found that the issue is with OpenLP and the AMD Radeon Graphics processor. I have tested version 3.1.0R2 on two Win 11 laptops with AMD Radeon Graphics onboard with and AMD RYZEN 5000 series. They have the same problem!
1) Cannot change to desktop view. On the system with AMD and NVIDIA GPUs, but using only the AMD GPU, I click on the Desktop View icon and the presentation screen goes black. I can click on that screen and it will show.
On the system with only the AMD GPU, when I click the Desktop view icon, the screen remains black. Clicking on the screen makes no difference.
2) A similar problem occurs when running a video in the service. The audio will play, but the video is black. Again, on one system I can click on the presentation screen and the video will come alive. On the other system it remains black.
I am sure there is an issue with the communication with the AMD GPU.
If you need more information, I will try to help.