Okay. I had tried everything else, e.g., launching to factory state, changing screen resolution, deleting non-default UI files. But when I went to the Material Room and saw they were there, even though I did not have a "UI dot I keep saved in cases like this," I did have a UI dot saved from sometime in the past. Since I'd already tried everything else suggested with no result, I decided to click on that dot. My dots are back in the Pose room! Thanks, kuroyume0161. And thanks to everyone else who made suggestions. Now all I have to do is figure out which file(s) to make a backup copy of ...