The frevvo tenant admin manages form/workflow and control templates. Template menu items are only accessible if you are logged into frevvo.
Manage Form and Workflow Templates
Tenant admins can promote published templates to make them available to any designer in the tenant, or remove templates. Please see the Manage Templates documentation for details.
Manage Control Templates
Control Templates, added by designers in a tenant, can be deleted from the database by the tenant admin. Click Manage Control Templates on the tenant admin page. There you will see the list of published controls and can remove them one by one.