See link below for details on unassigned licenses https://communities.bentley.com/communities/other_communities/licensing_cloud_and_web_services/w/wiki/44008/practitioner-licensing#what-happens-if-left-unassigned

OpenGround Cloud contains tools for User Management, which allows you to control the level of access users will have to individual projects, as well as at the system level. For more information on User Management, please refer to the Professional User…