Searx/searx/templates/oscar/advanced.html

<input type="checkbox" name="advanced_search" class="visually-hidden" id="check-advanced" {% if advanced_search %} checked="checked"{% endif %}>
<label for="check-advanced">{{- "" -}}
    <span class="glyphicon glyphicon-cog"></span>
    {{- _('Advanced settings') -}}
</label>
<div id="advanced-search-container">
  {% include 'oscar/categories.html' %}

  <div class="row">
    <div class="col-xs-6">
      {%- include 'oscar/time-range.html' -%}
    </div>
    <div class="col-xs-6">
      {%- include 'oscar/languages.html' -%}
    </div>
  </div>
</div>