We acknowledge the demand for this capability and are exploring the best possible solutions to enable this.
Also if you are in a chat and need to go to files in some teams to bring up a document, you need to leave your chat window, lookup your document and then click back to your chat..
We use this a lot in our enterprise. For example with our technical vendor, they update their lists for each function area and when we need contact with a certain area but don't know the actual members. We check the group and see who is present in that function. Really important for us to be able to leave Island mode and go to TeamsOnly.
We’re currently working on defining a compact mode experience. I will post more details when we have more to share.
Not sure it's mentioned, but I also see that i need to leave chat if need to go elsewhere like files in a team to find a document that we are discussing and then moving back to chat. To be able to release/float chat window would be great.