public static function move_elements_manager(
        FieldList $fields,
        string $relationName,
        string $newTabName = 'Root.Main',
        string $insertBefore = null
    ): FieldList
    {
        $itemsGf = $fields->dataFieldByName($relationName);
        $fields
            ->removeByName($relationName)
            ->addFieldToTab($newTabName, $itemsGf, $insertBefore)
        ;

        return $fields;
    }