If you no longer need to have leave that you have requested and it is still pending, you can cancel your leave request.
To do this, log into your app and go to the Leave tab (indicated by a plane icon at the bottom of your screen). Tap on the tab 'Pending' to see all leave which hasn't yet been actioned by your employer.
Tap on the leave you'd like to cancel then tap 'Cancel Request' at the bottom of your screen.
Confirm by taping 'Yes, delete' to confirm and your manager will no longer see this.
If your leave has already been approved and deducted from your leave allowance, you will not be able to cancel it yourself. If you speak with your manager, they will be able to advise you on this.