I haven't found a replacement yet, because it shut down after being bought a few months ago, but my team really enjoyed using Multi which is your run of the mill webcam/screenshare team app (like slack huddle) except it had rooms that stayed open and people could hop in and out.

We had a room for my team, and other teams, and we did a lot more "sit beside one another" type work/conversations with that.

If anyone knows another app with the rooms, and hopefully that lets multiple people screenshare at the same time please let me know.