Multiple Teams app windows
First let me say that I'm quite please with Teams for Linux so far. Between Teams and Office 365, my use of Linux in a corporate environment is much improved. Thank you.
However, it should be possible to have separate windows and to "tear off" tabs and individual chats from the application window.
Generally speaking, it should be possible to have separate windows for any Teams function. Currently, it is quite sluggish to switch between different functions and being constrained to a single window exacerbates the problem. This would be solved if I could tear off, say, a Files tab from one team, a couple of ongoing chat windows, and a meeting window and place and resize them as I see fit.
Whatever you do, don't make these tear off windows behave like Windows Explorer where the **** on the left side of the window is replicated wastefully on every Explorer window.
Anup Mitra commented
Here is a workaround to open multiple Teams instances. Open Teams in your browser and you can use several browsers to get to different Teams modules. Address: teams.microsoft.com
BTW, There are several entities of this same idea. Someone may want to combine them into one.