And thank you for this information. In the meantime I switched to the 2016 version hoping to fix the problem which remained the same.
Thank you for P.Guimbertau's channel which teaches us a lot of things but not this one. I don't blame him for anything because he's against icons. He therefore did not address the problem on his videos. In any case, the rest of the videos are very useful. Thank you.
As far as the window is concerned (as for Windows) nothing happens. The windows remain floating.
There is a possibility by right-clicking on the window/Lock location where we have two choices but they don't work. Should we deduce that there is a problem in the Mac-related software?
It doesn't stop me from working, but these windows are annoying when the object space is full screen.