Offered and Joined Sessions
The Offered Sessions list is available in X Manager for Domains. Shared sessions are available if an owner of a running session adds you to the Allowed Users list for the session.
The Joined Sessions list is available in the standalone X Manager. This list is empty until you join a session. To join session, you need a connection URL sent to you by the owner of the running session.
If you don't use session sharing, you can hide the Offered Sessions or Joined Sessions item from view using the Preferences Dialog Box.