@Wyldanimal I will test this later on, but the issue doesn't really bother me. I thought at first that it is designed that way - that when you minimize your software, the show defaults to small mode - although I couldn't think of why that would happen only if I move my mouse :)
@TheEmu I should have mentioned that I use regular PC and wireless mouse (no touchpad). And in this phase...
3b) Wait for a full minute and don't tap mouse on anything, just keep the cursor in one place. Then simply move the mouse slightly over the model, again not tapping on anything, and the show switches to small size.
... I deliberately moved the mouse very slightly holding it just between my thumb and index finger - palm was not on the mouse and I didn't have any fingers even close to the buttons.
As I said, not a big deal but maybe interesting information to developers. Maybe this depends on what graphic processor one uses? To me that happens only if I have GPU selected instead of CPU (my PC has "NVIDIA GeForce GTX 1070"). In my graphic settings in Windows I have given vghd.exe "Best performace"-setting (only software in that category, the rest are "Let Windows decide"). EDIT: if I remove that "Best performance"-setting from vghd.exe and let that be decided by Windows as the rest of the programs, it doesn't have effect on this issue.