Tablet Mode, or What the heck happened to my Desktop?!
You’re using Windows 10, minding your own business…
Suddenly, after clicking something near the system tray in the lower right corner of your screen, you are met with the weirdest desktop you’ve ever seen.
Your Start Screen tiles are displayed on your desktop, desktop icons are missing, and generally things just “look weird”.
You just accidentally enabled Tablet Mode. It’s pretty easy to both a) turn it off, and b) make it easier to turn off in the future.