"bar" is an overstatement if you like me were reading that as one of those early 2000s era browser toolbars. A recent Edge update added a fairly large and persistent Bing icon to the right end of the browser's menu bar. It uses a speech bubble design and is likely part of the push for AI chat powered Bing search. It's obnoxious that you can't hide it but it's more of an eyesore than an actual problem.