To cancel an order or all orders using the cancel buttons

The cancel buttons are at the bottom of the trading window.

•      Click X Buys to cancel all buy orders for current symbol for this account.

•      Click X Sells to cancel all sell orders for current symbol for this account.

•      Click X All to cancel all orders for current symbol for this account.

•      Click X Global to cancel all orders for all accounts

Go to Setup > Preferences > Display Configuration and select the Enable liquidate and reverse buttons check box to view the cancel buttons.