dsfr4drupal-1.x-dev/templates/system/admin-page.html.twig

<div class="clearfix">
  {{ system_compact_link|add_class('fr-text--sm') }}

  <div class="fr-grid-row fr-grid-row--gutters">
    {% for container in containers %}
      <div class="fr-col-12 fr-col-md-6">
        {% for block in container.blocks %}
          {{ block }}
        {% endfor %}
      </div>
    {% endfor %}
  </div>
</div>