src/view/sidebar.inc.twig
<div class="col-md-4 position-relative" id="sidebar-col">
<div id="sidebar">
{% block sidebar %}
<div class="sidebar-buttons">
<h2 class="visually-hidden">{{'Sidebar listing: list and traverse vocabulary contents by a criterion' | trans}}</h2>
<ul class="nav nav-tabs-no-style nav-justified" id="sidebar-tabs" role="tablist">
{% for view in vocab.config.sidebarViews %}
{% if view == 'alphabetical' %} {% set view_trans_text = 'Alpha-nav' %}
{% elseif view == 'hierarchy' %} {% set view_trans_text = 'Hier-nav' %}
{% elseif view == 'groups' %} {% set view_trans_text = 'Group-nav' %}
{% else %} {% set view_trans_text = vocab.config.showDeprecatedChanges ? 'Changes-and-deprecations-nav' : 'Changes-nav' %}{% endif %}
{# active_class is used to set initial active tab and disabled_class is used to disable hierarchy tab #}
{# On vocab page active tab is set to defaultSidebarView, on concept page active tab is set to defaultConceptSidebarView #}
{% set active_class = (request.page == 'vocab' and view == vocab.config.defaultSidebarView) or (request.page == 'page' and view == vocab.config.defaultConceptSidebarView) %}
{# Hierarchy tab is disabled on vocab page if showTopConcepts is set to false #}
{% set disabled_class = request.page == 'vocab' and view == 'hierarchy' and not (vocab.config.showTopConcepts) %}
<li id="{{ view }}" class="nav-item">
<a class="nav-link{% if active_class %} active{% elseif disabled_class %} disabled{% endif %}"
{% if disabled_class %}data-title="{{ 'hierarchy-disabled-help' | trans }}"{% endif %}
role="tab" data-bs-toggle="tab" href="#tab-{{ view }}" aria-controls="tab-{{ view }}">
{{ view_trans_text | trans }}
</a>
</li>
{% endfor %}
</ul>
</div>
<div class="tab-content">
{% for view in vocab.config.sidebarViews %}
{# active_class is used to set initial active tab #}
{# On vocab page active tab is set to defaultSidebarView, on concept page active tab is set to defaultConceptSidebarView #}
{% set active_class = (request.page == 'vocab' and view == vocab.config.defaultSidebarView) or (request.page == 'page' and view == vocab.config.defaultConceptSidebarView) %}
<div class="tab-pane{% if active_class %} active{% endif %}" id="tab-{{ view }}" role="tabpanel"></div>
{% endfor %}
</div>
{% endblock %}
</div>
</div>