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.