Hi @pagalo,
Yes, you can do that. All you have to do is type the short form of the default country in the field options. Click on the country field in the form builder and it will show up with the field options on the left. Now Click on the Advanced Options tab, underneath it, you will find a default value input box. Now type in the short form name of your country in capital letters. For example, you will have to type AR if you want to set up Argentina as the default country. Update the form and that’s it. It will display the default country in the Country field.
Do let me know if you have other questions and I will get back to you.
Regards!