Since the last couple of days i cannot resize/redock my properties tab into my studio. It seems like it is opened out of Roblox Studio, I can drag it, i Can close it etc. But nothing else. Also my properties Tab is 5 times longer than my screen, in lenght. Here is a Link to my issue: http://prntscr.com/r2hxnb
I may know how to fix this:
Drag the properties window over to the Explorer, as if you were trying to move it off the screen. If you do that is should fit exactly into where the explorer is.
If this helped please accept this answer.