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By clicking on the "Addresses" page, you will have access to the list of your customer's addresses (home, work, etc.). You can edit them using the "Edit" button, or delete them altogether.
Below the addresses table is the "Set required fields for this section" button. It opens a form where you can indicate if a database field is necessary or not by checking the appropriate boxes: this way, you can make it so fields such as "company" or "phone number" are mandatory when a customer is registering a new address on your shop.
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