Yeah it’s a new CoPilot service in Edge that keeps Edge processes running all the time, even when closing the browser. I had disabled background process option and startup boost, and yet Edge processes would never close. I ended up using 3 or 4 different group policies for Edge until that CoPilot service finally went away for good. Now the browser processes actually close. It was also interfering with clearing cache as well. You can always count on MS for taking a great browser like Chrome and throwing heaps of garbage on it until it stinks.