Edit category_items(_html5).php and find the old <form> ... </form>
e.g.
<?php if ((($this->params->get('use_filters', 0)) && $this->filters) || ($this->params->get('use_search')) || ($this->params->get('show_alpha', 1))) : ?> <form action="<?php echo $this->action; ?>" method="post" id="adminForm">. ... </form> <?php endif; ?>
Replace the above with the new form:
<?php ob_start(); // Form for (a) Text search, Field Filters, Alpha-Index, Items Total Statistics, Selectors(e.g. per page, orderby) // If customizing via CSS rules or JS scripts is not enough, then please copy the following file here to customize the HTML too include(JPATH_SITE.DS.'components'.DS.'com_flexicontent'.DS.'tmpl_common'.DS.'listings_filter_form_html5.php'); $filter_form_html = trim(ob_get_contents()); ob_end_clean(); if ( $filter_form_html ) { echo '<aside class="group">'."\n".$filter_form_html."\n".'</aside>'; } ?>