I was working on my laptop with someone on the phone for work and suddenly my PC became completely unusable. There was no task bar and every program would fill the entire screen. There were no ways to switch and no start menu. Just tile, acres and acres of tiles.
While talking I was scrambling to fix this mess. I finally just rebooted and when my desktop came up for a precious few seconds it switched back to this new shitty configuration.
Googling on my phone (while on the phone and trying to stall because I needed my PC for the call). I discovered this was probably Tablet mode and I should jut simply go to settings and tablet mode and turn it off. Well guess what, there were settings for Tablet mode but no on and off there.
Finally, and mostly by accident I found where I had turned it on. It was a button at the bottom of my notification screen I never even noticed was there. I must have slipped with my mouse and clicked it on. I turned it off and everything was normal again. I deleted that fucking button immediately and set the PC to never switch it on again (see that setting was under tablet mode settings but not a way to turn the fucking setting off).
Fuck Microsoft and their fucking useless tablet mode.