The top-of-the-screen, right-side symbols for minimize, make LR window less than full screen, and the X to close LR have disappeared. All the "tricks" I have used in the past don't help, and when I am using LR I can't get to my Windows task bar. I can't even click on the top of LR and drag it to let go of being full screen. So the only way I have left to get to another window or program is to close LR.
I tried left-clicking, right-clicking, with and without the Ctrl, Windows, Alt and Shift keys in all combinations, and in desperation, several regular keyboard keys such as w, c, x, f, v, etc but of course they don't do the job.
I've been using LR since it was invented, and I don't think I'm as dumb as this makes me feel. Wha happened?