Omnibus — show the lowest price By Marcin Pietrzak: FOX - WooCommerce Currency Switcher Professional

Plugin link: https://wordpress.org/plugins/omnibus/

Signal is sent: https://wordpress.org/support/topic/compatibility-with-fox-currency-switcher-professional-for-woocommerce-3/

into file wp-content\plugins\omnibus\includes\iworks\omnibus\class-iworks-omnibus-integration.php add next code

if (class_exists('WOOCS') AND $price_to_show > 0) {
    global $WOOCS;
    $price_to_show = $WOOCS->woocs_exchange_value($price_to_show);
}