Could you post a screenshot because I can’t imagine why a full screen app in Stage Manager would behave differently from regular full-screen. The only SM control I can think of is the corner grab handle, and you can effectively move that by shifting the app window from one side to the other. But yeah Apple can’t force Microsoft to play nice with Stage Manager.…iPadOS on the other hand - Stage Manager is a mess I wanted to like, but it effectively blocks part of some apps like Teams with it's controls, making it literally impossible to hit the 'send' button when using Teams, for example, full-sized.