Filter country name.php

add_filter('fluentform/editor_countries', function ($country_names) {
    foreach ($country_names as $key => $value) {
        if (preg_match("/\([^)]+\)/", $value)) {
            $replacedValWithSpaceInBetween = preg_replace("/\s+\([^)]+\)/", "", $value);
            $country_names[$replacedValWithSpaceInBetween] = $replacedValWithSpaceInBetween;
        } else {
            $country_names[$value] = $value;
        }
        unset($country_names[$key]);
    }
    return $country_names;
});