The configuration settings can be opened from the Marketplace > Vendor Configuration in the menu section.
Enable Shipping Per Product For Vendor
When set to Yes, vendor shipping per product shipping method will be enabled and the vendor will see this option in vendor shipping method panel, otherwise, this shipping will not be available for vendor.
Enable Shipping Per Product Method From Admin
This module is based on the shipping per product method of Magento 2. So this shipping method should be enabled by the admin. Admin can enable the shipping per product method by going to the Stores > Configuration > Sales > Shipping Method section. Here you will see the “Shipping per Product” group.
Set the “Enabled” field to “Yes”. Now, this shipping will be available to the vendor and the customer will see the vendor shipping per product method at frontend.