You can cancel an order anytime within market hours provided that the order has not been fully executed or matched. However, you cannot cancel an order during the pre-open period from 9:15 AM-9:30 AM on trading days, during market recess, and during the pre-close period from 2:48 PM-2:50 PM.
- From the Orders page, tap the order you want to cancel
- Tap Cancel
Note: The canceled order will reflect on the "Orders page".