While doing a screen share from MS Teams from within a published desktop, the pin option to either pin/un-pin the control bar on the extreme right is not available now. The MS teams screen sharing control bar now persists and you are unable to remove it. This blocks the user from selecting a tab within their browser which is now blocked by the MS teams screen sharing control bar .
Unknown.
Issues relating to UI/UX for Microsoft Teams are to be resolved from a Microsoft perspective.