neowin[.]net/guides/how-to-enable-full-screen-xbox-experience-on-any-windows-11-pc/
This is one of those at your own risk sort of things, so it's a good idea to back everything up etc. You'll also want to have a game pad attached as that's what this is designed for. You start by downloading & installing a 3rd party app, restart, check for and install any updates from Windows Store, and change some settings in Settings.