To cancel orders

• Go to Prestashop Admin panel.
• On the left navigation bar, move the cursor over the Cdon Integration menu.
  The menu appears as shown in the following figure:

• Now click the Cdon Orders menu.
• The page appears as shown in the image below:

• Now, to cancel the order one by one, select the order and then click on the drop-down arrow adjacent to the View button and you may see the button like this:

• You may click on the Cancel At Cdon button and the order will be canceled.
• A pop up will appear 
• Click on Ok.