Free Shipping Option just works as country based. While adding Shipping Rates from your Countries & Shipping menu, you can specify a Free Shipping option for a specific country. When you do that, all of your products will be set as "Free Shipping" for the related country.
- Go to your Settings >> Countries & Shipping menu and click on the Add Country button.
- Select your country from the pop-up window. If you want, you can also select multiple countries. For that, select your first country. And then select another country from the list. When you are finished with selecting process, choose Free Shipping from Criteria drop down menu and click on the SAVE button.
Now all of your products are set as Free Shipping for the selected countries.
(In our Ex. Brazil, Ecuador and Mexico.)