Alright some I’m an avid gamer, and recently, from about a week or so ago, I have two monitors, my main one, running off my GPU and a secondary running off my cpu, my games, I obviously run on my primary. OK so, every time my game is running and I click the windows icon, or click at all on my second monitor it minimises my game on the primary monitor, even alt tabbing to an app on my second monitor minimises my game, I play some steam games and others like VALORANT and halo I’m on windows 11, latest update.
You are most likely better of connecting both monitors to your real GPU.