You can cancel a pending withdrawal via the app if the clearing firm has not processed it yet. The cancellation period varies according to the time you initiated the withdrawal. You can check the withdrawal status by the following steps:
1) Tap "Transfer" on the home page and then Tap "Deposit"
2) Tap the "History" button (clock icon) on the top right.
3) Tap the withdrawal you want to cancel.
4) If the "Cancel" button is still active, you can tap on it and cancel your withdrawal. If the status is not "Pending," you cannot cancel the withdrawal since it has already been processed by the clearing firm.