Customer can edit and update the desired delivery date for the order. As an admin, you can enable the Update Deliver Date option for the customers.
Allow customer to edit delivery date: By selecting Yes, you can allow the customer to edit the selected delivery date once again and update the delivery date.
Note: Update delivery date is only applicable if the delivery period is selected from the Checkout Page and Order Shipment is not generated yet.
Rule Condition to allow editing: Admin can define the rule option based on the selection of either Order Status or Day.
Order status can be rescheduled: Select the Order status in which case the customers can edit the delivery date information.
Day: If admin selected Day, the Time interval to update day will be available to select no. of days before that customers can edit the selected delivery date.