In the Studio > All Sessions list > Joined, please add an 'info' icon or popup on hover that quickly shows information about the session without having to open it. Ideally the following:
Created by
Creation date
When you last visited
Number of docs in the session / Number of docs added or removed since you last visited
Number of attendees / Number of attendees joined since you last visited
Number of record actions / Number of record actions since you last visited