This provides an overview of connected users and devices sessions.
Sessions Table sub-tab
This lists all users actively connected to the system, where they are connected from, and the time period. 
Terminate Session
Go to Tracking :: Open Sessions :: Sessions Table.
In User column, locate session and select checkbox.
Click Terminate.
Devices Table sub-tab
This shows information about active device sessions, the amount of connected session and the users which are connected. 
Terminate Session
Go to Tracking :: Open Sessions :: Devices Table.
In Device Name column, locate session and select checkbox.
Click Terminate.