To delete the leave:
Please head to Leaves section on the left navigation bar and select "History" section.
You'll find "Employee Leave History" section. Select the employee name from the dropdown menu, other relevant details (Leave type, date range) and hit update.
Scroll down the page and you will find a list of approved leaves. Click on the delete button and the leave will be removed.
Note:
The manager and employee will receive an email notification for it.
To delete your own leave, just click on this link.