On this page the admin can see a list of customers and the application name in which the access token is active for those customers. This page also gives an ability to the admin to search through active customers list based on the customer email, customer first name, customer last name, customer roles and the application.
The admin user can choose to revoke access of a customer for an application. Once revoked, the customer will be unauthorized and they will have to authorize again for an application to start using the application.
Once you click on the Active tokens menu item, It will display the active tokens page as shown in the image below.