From my experience your mileage may vary when it comes to being able to keep both monitors on. The concept of a primary monitor on wayland doesn’t exist, and my games always choose the wrong monitor to render on. The game will open on my primary monitor but i can only select the resolution and refreshrate of my secondary monitor in the game settings. If you have identical monitors that would probably not be an issue, but i don’t. Setting the primary xwayland display with xrandr helps for some games, but not all. The best solution for me ended up being to disable my secondary monitor when gaming.
From my experience your mileage may vary when it comes to being able to keep both monitors on. The concept of a primary monitor on wayland doesn’t exist, and my games always choose the wrong monitor to render on. The game will open on my primary monitor but i can only select the resolution and refreshrate of my secondary monitor in the game settings. If you have identical monitors that would probably not be an issue, but i don’t. Setting the primary xwayland display with xrandr helps for some games, but not all. The best solution for me ended up being to disable my secondary monitor when gaming.