Elgg-Lorea-Hydra/views/default/page/elements/sidebar_alt.php

<?php 
/**
 * Elgg secondary sidebar contents
 *
 * You can override, extend, or pass content to it
 *
 * @uses $vars['sidebar_alt] HTML content for the alternate sidebar
 */

$sidebar = elgg_extract('sidebar_alt', $vars, '');

echo $sidebar;