admin/structure/menu/manage/mymenu

function gestionuser_preprocess_page(&$variables, $hook) {
    if(!empty($variables['page']['content']['system_main'])) {
        foreach ($variables['page']['content']['system_main'] as $key => $value) {
            if(is_array($value) && !empty($value['view'])) {
                //print '<pre>'; print_r($value['view']['#href']); print '</pre>';
                $value['view']['#href'] = '';
                $value['view']['#type'] = 'text_format';
                //unset($value['view']);
            }
        }
    }
}