fastapi-admin/fastapi_admin/templates/components/dropdown.html

<li class="nav-item dropdown {% if resource_label in resource.resources|map(attribute='label') %}
                        active
                        {% endif %}">
    <a class="nav-link dropdown-toggle" href="#navbar-base" data-bs-toggle="dropdown"
       role="button" aria-expanded="false">
                                  <span class="nav-link-icon d-md-none d-lg-inline-block">
                                    <i class="ti ti-package"></i>
                                  </span>
        <span class="nav-link-title">
                                    {{ resource.label }}
                                    </span>
    </a>
    <div class="dropdown-menu {% if resource_label in resource.resources|map(attribute='label') %}
                        show
                        {% endif %}">
        <div class="dropdown-menu-columns">
            <div class="dropdown-menu-column">
                {% for item in resource.resources %}
                    {% if item.type == 'link' %}
                        <a href="{{ item.url }}" class="dropdown-item {% if resource_label == item.label %}
                        active
                        {% endif %}" target="{{ item.target }}">{{ item.label }}</a>
                    {% elif item.type == 'model' %}
                        <a href="{{ request.app.admin_path }}/list/{{ item.model }}"
                           class="dropdown-item {% if resource_label == item.label %}
                        active
                        {% endif %}">{{ item.label }}</a>
                    {% elif item.type == 'dropdown' %}
                        {% with resource=item %}
                            {% include 'components/dropdown.html' %}
                        {% endwith %}
                    {% endif %}
                {% endfor %}
            </div>
        </div>
    </div>
</li>