These buttons below DOMTrader grid are used to cancel groups of orders. The number of orders that will be canceled by each button is displayed on the button in parentheses.
•X Buys = cancel all buy orders for current symbol for this account.
•X Sells = cancel all sell orders for current symbol for this account.
•X All = cancel all orders for current symbol for this account.
•X Global = cancel all orders for all accounts
•X All/Liq All: cancel all orders and liquidate all positions for the current account.
Go to Setup > Preferences > Display Configuration and select Enable liquidate and reverse buttons to view the cancel buttons.