Bring back the Team Name at the top of a channel
We need the Team name brought back to the top of the Channel (what I call the header area). Organizations that run multiple teams may have the same channel name in hundreds of different Teams. Now that you took away this information it is much harder to know what Team you are working in. Also, since the left Teams List is so horribly broken and doesn't syncronize to what Team you are currently in, the only way to change channels withing a team is to use the old control (now hidden!) from the top of the header area. With this new change, it takes many more button clicks to hover over the Team icon, and then use one of the random icons shown at the bottom to bring up the old panel where the "Channels" tab is show. This is the only way to change channels if you can't see your team listed in the left pane.
Also, this makes it very hard to leave a Team since again, you added so many more clicks to get to the ellipsis that allows users to leave a team.