Searching for an order? Select an order and click Select & Stay to place it in the Selected Orders pane on the right. Then search for your next order right from the same window. Click Accept when finished placing all your orders.
Right-click in the Order Composer or press Alt+A to close it, instead of clicking Accept.
When searching for an order, use the Up/Down arrows to select an order and Enter to add it to the list of orders to sign.