You can block individual or multiple users which removes their access.
To do this go to USERS > User List. Then, select staff to be blocked in the tick boxes, next to the Actions column on the Active Users list. Next, click Block Selected.
Blocked users appear in the Blocked Users list at the bottom of this page. From here, you can unblock or delete users by, again, selecting them in the Actions column, then using ‘Unblock/Delete Selected’.
Once a user has been deleted, it cannot be undone, however, if they return to school, you can simply create them as a new user again if they need access.
Video Tutorial - Managing Users:
Thanks for reading!