This whole system of custom repos does indeed need a bit of work to make it more intuitive imo. Some F-Droid clients like Droid-ify fortunately make this a bit easier by already providing some popular repos (including microG) that you just have to enable.
Glad you figured it out, though 😊







Then you’re either not using the native wayland driver, or you’re running apps that don’t use cross-process rendering. Try Ubisoft Connect or Jagex Launcher. Ubisoft Connect just displays a tiny window with nothing in it, but is probably supposed to show an error message, and Jagex launcher just shows a black screen, according to this comment.
So unless you use a wine version patched to include the cross-process rendering code that was apparently already developed by Collabora (which I think is located here), you’re not gonna get these apps to work.