James form ACF support gave me the solution :
https://www.advancedcustomfields.com/resources/acfsettings/
Add this on your function.php and replace XXX by your Google API KEY https://developers.google.com/maps/documentation/javascript/get-api-key :
function my_acf_init() {
acf_update_setting(‘show_admin’, false);
acf_update_setting(‘google_api_key’, ‘xxx’);
}
add_action(‘acf/init’, ‘my_acf_init’);