Is there a way to change this? It’s not on my main HD.
Just move the project folder to the place where you like and open it from there -> I did it like that in the old version of the UE4 (dont know if this is still working ^^)
You can create a project anywhere, when you create a new project just changed the directory it’s created in 
Also like said, you can move a project post-creation to any location and open it from there.
That’s great, thanks!