The CurrentUserPresence widget is a prefab that can be used to see the currently active user presence.

The CurrentUserPresence prefab requires the Gameboard GameObject to be present. Find the Gameboard menu at the top of the unity header and click "Add SDK" to add the Gameboard GameObject to your project. If you do not have the Gameboard menu options, see Gameboard SDK Access

Navigate in the Project explorer to Packages > Gameboard Unity > Runtime > Tools > Prefabs and look for the one named CurrentUserPresenceList.prefab

And drag the prefab into your scene. You should see a scrollable rect

Once running the game, the widget will display the currently connected users based on the UserPresence.