ac-export-exporter_csv-delimiter.php

<?php
/**
 * You can alter the delimiter with the hook `ac/export/exporter_csv/delimiter`
 * The default value is ','
 */

/**
 * Change the default export delimiter from a ',' to ';'
 *
 * @param string $delimiter Default is a comma ','
 *
 * @return string
 */
function acp_export_change_export_delimiter($delimiter)
{
    return ';';
}

add_filter('ac/export/exporter_csv/delimiter', 'acp_export_change_export_delimiter');