Menubar can be configured to auto-hide, though it’s kinda moot on the built in screen of M1 Pro/Max machines since those have a strip of added pixels on the top for the menubar to live in. Won’t hide the titlebar but that’s such a small part of the screen it’s never bothered me…. But then again I make use of titlebars frequently, the hotkey-dragging of tiling WMs drive me crazy.