When you are in the Team Room Home or Retrospective tab, the left sidebar shows a list of everyone who has access to the Team Room.
Those who are currently present in the Team Room will be shown at the top of the Participants list. The facilitator will have an orange circle surrounding their avatar and the word Facilitator above their name.
Guests (public Team Rooms only) will be displayed in this list and be designated with Guest above their name.
Members that are grayed out and displayed as Absent have access to the Team Room but are not currently active in the Team Room.