Text Chat is only needed for one game yet it lingers for hours after. Before crossplay it was simple - it was off. It's poping up especially when you are doing postmaster does not help a lot. 
Who knows how to clear it on Xbox?
Bungie's docos keep silence on the matter.
						
					
					
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	Sorry if this is a bit of a thread resurrection, but a good way to do this is to type `/?` into the chat - this will show chat instructions, and essentially clear previous chat (I typically use this for obnoxious public chat content that I don't want to look at :) ).