I see no option is game to choose which monitor fullscreen will open on. Even when I play on windowed and drag it to my external monitor, Windowed Fullscreen: Game starts on wrong monitor - Heroes of. Each time I launch a full screen game it opens it on the primary monitor with no way to move it to the second one. I tried opening it from the. Make your "secondary" (the one you want the game to display the the secondary monitor feel like the primary, and the games start on the.