Use the Mosaic Trades tab in the Activity panel to modify and re-submit orders that have not yet filled. Simply click in the order line and change parameters that are available for editing. Once all changes are made, click the yellow Update button in the order line to transmit the changed order.
How do I make changes to a working order?
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Where can I see my order and trades activity in Mosaic?
How do I cancel an order in TWS?
How do I place bracket orders with a different quantity than the primary order in TWS?
How do I save orders in TWS?