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 Members list. The facilitator will have an orange circle surrounding their avatar and the word "Facilitator" above their name.
Members that are grayed out have access to the Team Room but are not currently active in the Team Room.
Guests will also be displayed here and be designated as "Guest" above their name.