You can establish what country will appear as a default in your Address field. Simply go to your Form Editor and click on the Address field to open its Edit Field panel.
You’ll find a dropdown list labeled Default country, where you can select the country that you want to have preselected when users access your form.
The first option in the list is Autodetect. This option is set to detect the country where form users are located, based on their IP addresses, and to have it preselected in the Country subfield.