Not sure if this is a Surface-specific thing but here goes. When I snap a window to the left or right, and it fills half the screen, I then pick something I want in the other half. If I then shut one of the windows down, I’d expect the remaining one to fill the screen again but it doesn’t. I have to manually drag the findow full screen.
a. Is this normal?
b. Is there a short cut to snap full again? Even maximising doesn’t work as it’s treating the screen real estate as 50% of its normal size.