The Settings panel in the product editor includes several options for the product:
Sets the product to appear in the Feature Products collection.
Turns on the product variant options features for the product, which allow you to set up variant product option menus, and manage each product variant.
Turns on the product add-on options features for the product, which allow you to set add-on option menus, and manage each product add-on.
When using a third-party online shipping estimate service, this setting ensures the shipping estimate for the current product will always be quoted as a separate package.