Reverse Summary Block Post Order: oldest show first

You can use this code to Page Header Injection

<!-- @tuanphan - reverse summary order -->
<script>
document.addEventListener('DOMContentLoaded', function() {
  const summaryList = document.querySelector('.summary-item-list.sqs-gallery');
  
  if (summaryList) {
    const items = Array.from(summaryList.querySelectorAll('.summary-item'));
    items.reverse();
    items.forEach(item => item.remove());
    items.forEach(item => summaryList.appendChild(item));
    if (window.Squarespace && window.Squarespace.FrontEnd) {
      setTimeout(function() {
        window.dispatchEvent(new Event('resize'));
      }, 100);
    }
  }
});
</script>