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Edit Order User Guide
Edit Order Overview Currently, Magento 2 only allows editing Customer Information and Address Information at the view order page. If you want to edit other information, you must go to the separated Edit Order page, then the old order will automatically be canceled and the new order will be created. Also, admin can only edit other information (besides Customer and Address Information) when Order is Pending. With Mageplaza Edit Order(https://www.mageplaza.com/magento-2-edit-o
Can I edit the information in the completed orders?
At present, Mageplaza Edit Order can support to edit the orders which are set up as Pending Status only.