Adjust Leave button is available from the Actions button. If you have your pay run open, click the employee name to show the pay run details for that employee. On the lower right, you should see 'Actions.' Click that button to see 'Adjust Leave.'
I have attached a sample screenshot for your reference.
The 'Adjust Leave' option is available from each employee's Actions button.
If you require further assistance, I would encourage you to reach out to our Support Team.