This is a know issue - that was a reason I advised to keep the your SU 2023.
You can use SU 2023, or you can use only one display. You can also claim, to customer service.
SU 2024 can not handle some screen configuration properly.
For me, for example, absolutely unusable. I have a dual screen laptop and even the context menu appears on the other screen. No solution for many months. 
See eg. this topic:
https://forums.sketchup.com/t/the-problem-with-display-windows-in-the-new-version-2024/266843?u=dezmo