Hi!
I have a little, irritating problem with my UE Editor. Picture:
Every window is separated and this weird black think on the right… How to fix that?
It is normal. It is called docking windows and very popular nowadays. So, you just need to click on the window tab/name and drag it to any place you want inside the big window (mostly to a boarder). And then drop it. and it will merge itself automatically with the main window.
Okey, it works. Thanks! 
welcome buddy. never hesitate to try things at the end of the day with the worst case, you will re-install the application !
Probably yes. I’ll remember and thanks again!