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 team
We are looking into having multiple windows for Teams.
And thank you for the interesting idea!
-WarrenMikael J commented
Agree that a chat-window would be good, especially if discussing content in a Teams channel you currently need to jump back and forth between the Chat and the Teams...