That does make a mess in mobile...
A quick way would be to modify the search.class.php file found in system/classes
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$retval .= COM_startBlock($LANG09[1], 'advancedsearch.html');
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$retval .= COM_startBlock($LANG09[1]);
The other option is to modify COM_startBlock found in lib-common.php and remove:
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if (($_CONF['supported_version_theme'] !== '1.8.1') && !stristr($helpFile, 'http://') && !stristr($helpFile, 'https://')) {
$helpPopup = "gl-help-popup";
// Only need to set it once
if (!defined('GL-HELP-SET')) {
define('GL-HELP-SET', true);
// Add in jQuery dialog for help file
$_SCRIPTS->setJavaScriptLibrary('jquery-ui'); // Requires dialog, draggable, droppable, resizable, and button
// Add Language variables
$_SCRIPTS->setLang(array('close' => $LANG32[60]));
// Add JavaScript
$_SCRIPTS->setJavaScriptFile('dialog_help', '/javascript/dialog_help.js');
}
}
since this generates the JQUERY popup. With this removed the help file will load in a new page.