I have seen a setting called monitor number in the file 'gameusersettings.ini' at C:\Users\yourusername\AppData\Local\HeliumRain\Saved\Config\WindowsNoEditor

I haven't used it personally but maybe changing it will do something?

There's probably a setting that can be put into one of the ini files to tell UE4 to open in the correct monitor but I don't know what that might be.

The only work around I can find is to open the game, lower the resolution, move the window to the main monitor, and bring it back to full resolution.

Note that I do indeed have my main monitor (the one I want to use) set as my main monitor in Windows settings, so that isn't the problem.

Well, in the mean-time, you might be able to move it over quicker by holding shift+windows and pressing the left or right arrow keys.

shift+windows and arrow keys did not work.

The MonitorNumber setting shoul work on Windows, 1 to N from left to right, 0 for Window's main monitor.

Ah, which ini file does that go into?

That would bhe 'gameusersettings.ini' at C:\Users\yourusername\AppData\Local\HeliumRain\Saved\Config\WindowsNoEditor.

Hm, ok so that leads to some rather odd behavior. I have 2 monitors: Windows calls them Monitor 1 and Monitor 2. The one that in windows is set to my primary monitor is called monitor 2 by windows (it does not re-number them based on which is primary).

Here's what happens when I change the settings:
- `MonitorNumber=0` Window on monitor 1 (*not* my primary monitor according to windows).
- `MonitorNumber=1` Window on monitor 1
- `MonitorNumber=2` Window starts about 3/4 of the way on monitor 1 and extends part way into monitor 2. So essentially the window seems to be in some random location between the monitors.

I suppose this is an UE4 bug? Is the game on the latest UE4 version?

Thanks for your help!