I have this same problem. Why the hell does there need to be a projection banner? especially one that cannot be moved when it blocking your damn toolbars or tabs. Also it appears in your notification center when you are projecting.
It is like you have no clue on how to notify the user that they Projecting and decide it good idea to hinder the user by placing the notification in the worst possibly place and then went oh there is notification center, lets added it there too.
Another one of Microsoft lets not think thing though.