As we announced at Microsoft Ignite 2019 this morning, we are excited to confirm that Multi-window capabilities are coming to Microsoft Teams, and will start rolling out to the public ring early next year!
Alex & the Teams teamMike Shelton commented
Teams does have some useful features but the idea of cramming everything into a single window and having to switch between conversations--especially doing a combination of groups (on the Teams tab) and chats (on the Chat tab) is--is *very* detrimental to communications. PLEASE return to the format used for Lync and Skype where there is one window with all your lists (groups, people, etc.) and separate windows for each conversation.
We’re currently working on defining a compact mode experience. I will post more details when we have more to share.