To cancel all working orders in IBKR Mobile:
- Tap the Account menu icon (head and shoulders) from the top left corner of the app.
- Tap Transactions. Note that if you chose to move Transactions to the bottom nav bar you won't see it in the Account menu.
- Tap Orders and then tap the three dots in the top right corner.
- Tap Cancel Orders and then confirm that you want to cancel all orders.