Admins can turn on/off the documentation, bulk actions and preferences tab at the top of the ticket list. To do this, go to the TICKETS->SETTINGS->PERMISSIONS and scroll down to the TICKET LIST TABS section:
Admins have the ability to control who can be prevented from seeing certain tabs and metaboxes. To access these permissions go to the TICKETS->SETTINGS->PERMISSIONS tab and scroll down to the TICKET DETAILS TABS AND METABOXES section: