There are many customizations and enhancements that you can make to the ngb-accordion component, and many more different types of interactive components provided by ng-bootstrap. For example, there is another template directive available for ngb-panel to customize the title of the panel to allow for more styling control. For instance, if I wanted to display my titles in bold and add a preview of how many posts have been written beside it, I could use the ngPanelTitle directive to do that:

<ngb-panel>
  <ng-template ngbPanelTitle>
    <strong>Brandon Bittner</strong> <small>(3)</small>
  </ng-template>
  <ng-template ngbPanelContent>
    <ul class="list-unstyled">
      <li>Post 4</li>
      <li>Post 5</li>
      <li>Post 6</li>
    </ul>
  </ng-template>
</ngb-panel>