In employee's calendar you can see the list of all leave requests approved,rejected and pending.
Screenshot of list of employee's requests
If leave request was pending for approval it can be easily can canceled by pressing cancel button as shown above. If request was already approved employee can revoke it but this will require approval from supervisor. To revoke leave request please press revoke as shown above. Then supervisor will have to approve or reject it. If you need to amend leave request please revoke or cancel it as mentioned above and create a new one.
Screenshot of supervisor list of requests to consider