I tried to play your game using the Forward Plus download. The game launched with 70% of the game on one of my monitors and 30% on my others. I played around with the display modes in the menus but it didn't look like it did anything.
I'm just using a basic 2 monitor extended display with Windows 10. The image below is what it looks like on my left monitor and my right monitor. Starting and restarting the game did nothing.
