Mark order status as completed when order status if fulfilled.
→ When admin changes the order status from Unfulfilled to Mark as Fulfilled Our order delivery date will also change the fulfillment status automatically at Order Delivery Date > Order Listing > Delivery Date Order and All Order.
→ Log in as admin to the website and go to the apps page.
→ Select the Order Delivery Date app.
→ Switch to the General Settings.
→ Look for Mark order completed when order fulfilled completely checkbox and check it to enable the option.
→ For the result of this option, please check the below image.