Games not being displayed properly - not using Wayland?

I’m using Bazzite, and I’ve got a couple of games that aren’t displaying correctly on my desktop, specifically Uplink (from Steam) and Kobo Deluxe (from a Flatpak). Although they open a window of the correct size, the game is not displayed in it. Instead, it’s displayed in the upper left corner in a rectangle the size of said window. In addition, the display is scaled up to full screen size before being rendered, which means that I’m only seeing the upper left corner of the game.

I’m guessing that the programs are so old that they don’t know how to use Wayland, but my experience is limited. What settings do I need to change so that the games will render properly in a window?

This is probably a Steam/WINE/Proton issue that may be hard to answer here, but I’m letting it through just in case another user can help you out.