With the filter you can integrate new separators for the CSV export. By default Excel uses , and ;. However, if you need a plus or a other separator, you can extend the list this way.

Place this code in your functions.php to add a plus to the separators:

 * Inserts a new separator for the CSV.
 * @param array $separators
 * @return array
add_filter('helpful_export_separators', function (array $separators) {
    $separators[] = '+';
    return $separators;
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