The select field is a simple dropdown input which allows the user to select from a pre-defined list of choices.
It sounds like you want a select list for the list of countries.
Then you will need to create another select field which will display the retailers. This choices for this select list should be left blank.
You will then need to hook into the acf/load_filed filter and populate the ‘retailers’ select list choices based on the value selected by the first select box.
This is not possible out of the box and will require some PHP, jQuery and AJAX functionality.
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