Hello ,
I’ve just built the template FPS project in UE4.18.1 (Epic’s version). No additional changes were made. I launch it with custom window size and location which are specified by arguments in command line. Watch the video below.
Expected behavior: the window remains in top left corner at location X=100,Y=100
I think this is good idea to place the window at center when you have ‘-windowed’ argument only. As I said before this bug appeared in UE4.16.