My computer turned itself into Tablet Mode and it won't come out despite settings
I had a laptop get confused in the same way a couple of weeks ago.
(Also after editing a photo.)
I had to ENABLE tablet mode in Action center first.
Then did a full shutdown.
Started back up and now Windows was again in Tablet mode and the indicator in the Action Center showed correct state.
Then I could switch off the Tablet mode via Action Center.
Still don't know how it got in Tablet mode in the first place. I have not been able to reproduce the effect either.