Sorry that is has been awhile. Thank you for your suggestions. My desk top is native at 4k. Before, when everything worked, I was running the desktop native at 1920 X 1080p. because I did not have the right hdmi cable, and I was not hooked up to the correct hdmi slot on the tv.
What is weird, is that the game in no longer in full screen in 2d. I have tried everything I can think of, with some help from Ghastly. I tried each scaling option for the Nvidia Geforce 2080 ti card. I tried going back to 1920 X 1080 (though this is no longer the native resolution.) I tried changing the text size from 200% back to 100 %. I tried disabling full screen optimization. Same result every time, in 2d the game appears in the middle of the screen, but only takes up a part of the screen on my 55 inch tv.
Any other suggestions guys? I’m stumped.
I am going to try the alt enter suggestion, but I would hate to be in a multiplayer game, forget to hit alt enter, and hit alt tab and freeze up the game forcing a restart of my computer. There is already so much to remember to do in a multiplayer session, I know that I will forget to hit alt enter from time to time!
Update, for some reason the game is now in full screen in 2d, so that is good, but it still stops working when I alt tab. If I hit alt enter, the game moves to the lower left corner and gets very tiny, and I then need to alt tab to get to task manager and close the program.