Resizable Teams List Pane
Resizing the side bar where teams are listed would be a great improvement to the interface of Teams. Because you can integrate so many apps into Teams, sometimes space can become an issue. For instance, when working on OneNote you might want to make documentation that has two side by side columns of work. If you could shrink the Teams List Pane on the left, you would be offered more workable space.
Perhaps you could be offered the option to have just the Icon with a personally identifying picture of the team to click on instead of the entire name. Or even just being able to resize the pane, regardless would help.
Eric Somitsch commented
I would welcome this too as many Team names are too long to read in the fixed pane making it cumbersome to search for the right team in the growing list of teams
Stew Stryker commented
I think Trevor's suggestion to follow the OneNote model would be perfect - it works well and it'd be consistent with that product.
Making the interface similar to the new onenote interface where you can minimize to a strip with a top button would really help. If you had this minimise to a column of Icons then you could pop out the teams from there with auto hide like experience.
This is one of my governors reasons for refusing to use teams yet until you fix it... :-(