smart-date-recurring-formatter.html.twig in Smart Date 3.x

<div class="recurring-output--wrapper">
  <div class="rule-text">{{ rule_text }}</div>
  {% if past_display %}
  <details open="open">
    <summary>{{ 'Recent'|t }}</summary>
    <div class="details-wrapper">
      {{ past_display }}
    </div>
  </details>
  {% endif %}
  {% if upcoming_display %}
    <details open="open">
      <summary>{{ 'Upcoming'|t }}</summary>
      <div class="details-wrapper">
        {{ upcoming_display }}
      </div>
    </details>
  {% endif %}
</div>