<style>
    #bd-docs-nav .toctree-toggle,
    #bd-docs-nav .toctree-checkbox {
      display: none;
    }
    #bd-docs-nav .toctree-l1 > a{
      font-weight: bold;
    }
  </style>
  
  <nav class="bd-links" id="bd-docs-nav" aria-label="{{ _('Documentation Contents') }}">
    <div class="bd-toc-item navbar-nav">
      <!-- Specify a startdepth of 0 instead of default of 1 -->
      {{ generate_toctree_html(
        "sidebar",
        startdepth=0,
        show_nav_level=4,
        maxdepth=4,
        collapse=True,
        includehidden=True,
        titles_only=True
      ) }}
    </div>
  </nav>