grav-lecampus/user/themes/lecampus/templates/partials/layout.html.twig

{% set item_col = show_sidebar ? 'col-9 col-md-12' : 'col-12' %}
{% set sidebar_col = show_sidebar ? 'col-3 col-md-12' : 'col-12' %}

<div id="item">
    {% block item %}{% endblock %}

    {% if show_sidebar %}
      {% block sidebar %}
        {% include 'partials/sidebar.html.twig' %}
      {% endblock %}
    {% endif %}
    
</div>