Window on the secondary monitor goes back to the primary monitor when it gains focus

Hi,

I’m running multiple instance of the same project on a single computer. Each instance has obviously its own window. I have one on each screen.

However, as soon as I gain the focus on my secondary monitor window, it goes back to the main monitor. I have lot of trouble setting up windows while running multiple instance at the same time. At the end, I manage to find a “clean” way to force back my window to the settings I want. Then when I update my engine version, I have to do it again cause Epic changed the way windows are handled. This is so frustrating.

Anyway the question is, why does the window on the secondary monitor goes back to the primary monitor when it gains back focus ? (the window is maximized, not fullscreen involved).

My other related question (long time ago with a bit more explanation about the issue…) When does the Engine set up the window ? - Platform & Builds - Epic Developer Community Forums

Best regards.