This menu comes with WooCommerce and can’t be managed in the way other WordPress menus work via Appearance -> Menus. It has the same links as the sidebar menu on my account page. Here is an article that should help you to edit this menu https://rudrastyh.com/woocommerce/my-account-menu.html
Excellent. You added Vendor Dashboard there. I want this item to be shown only to those users who have the Seller role and was hidden from the real Costumer. After they have created their store, they will have this item. How can I implement this?