Merge recent and contacts tabs or move contacts to right side
I like the new contacts list but I also use group chats a lot so I think this will lead to a lot of switching between recent and contacts.
I think an option merge this into a single tall view could be a good solution. Another possibility would be to move contacts to the right side to a separate collapsible list. This right side list could be shown even when you are in the teams view and could then also be used to show team/channel members.
A third way to do it would be to merge teams/recent and contacts into a single view with three tabs. You could also have some kind of "sub-tab" that shows up when you are viewing a team or channel to see it's members.
Feel free to suggest additional solutions that can help reduce the amount of switching, total time to complete the task or reducing the number of clicks.
Allow the Contacts list to "pop out" - ie, stand alone in its own window to conform with every other chat program. Usually I need my contact list visible at all times but I don't want the entire Teams window open.