The Security Center is where your organization permissions are set. Your organization creates security groups and assigns staff members to those groups.
Administrators always have full control of all modules. Administrators can also create a new access group and set the permissions, as the Administrator sees fit. See our article Permission Groups for more information.
Only administrators can manage permissions for other access groups. Administrators can revoke managers, front desk staff or any other security group's access. Admins can visit that page and click Permissions on the Quick Bar, located at the bottom of the page.