When using SketchUp on my new rig and it is maximized in my multi-monitor setup I can click around the top of the title bar and accidentally close windows that I have open behind it. This doesn’t happen if I am only working on the main laptop display with the other monitors disabled. Not sure if this is an issue with SketchUp or Windows. I can’t do the reverse, accidentally close other applications by clicking around the top of the title bar. It only occurs with SketchUp. Also tested with LayOut. LayOut behaves like it should.
There are display issues with the version of Qt libraries that SketchUp is using.
They are testing a newer version of those libraries.
Currently SketchUp works best if run on the “Main” Windows display. (I myself had to set my external UHD display as the “Main” Windows display because I run SketchUp on it.) This also makes display scaling work correctly for SketchUp as to sizing of GUI objects like toolbar button icons, web dialog content, etc.