This feature is available in all editions.
***Users are called members.*** Making a member's account inactive is the recommended method for disabling an account (instead of deleting) and preventing member access. This article provides instructions on how to "inactivate" and reactivate a member's account.
Inactivating a Member's Account
Inactivating an account also preserves the member's historical data for reporting purposes, removes them from your licensed user count, removes them from future assignment lists, and also allows the account to be reactivated at a later date if needed.
Select Admin > Member Admin > Members.
For the member you want to make inactive, select Inactivate from the Edit drop-down button.