We are still considering this feature for future releases, and will continue to update the status when it changes.
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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 teamAnonymous commented
I agree with all comments regarding the importance of this feature. We are trying to roll out teams as a platform, where some users do all of their work in teams, but multiple windows is a must.