I used to launch the game normally, but at one point when I was setting up the game I accidentally pressed the "default" button and when you start saving, the monitor displays the error “screen resolution not available”

The "default" button? Huh?

If it is a problem where the entire game says that (a popup or entire game window is covered, like the omega warning on start), check your screen resolution/regenerate data.sav in settings.

If it is a problem where in-game objects say that (monitors, ect), then I'm lost.