gnu-social/components/Collection/templates/collection/widget_add_to.html.twig

<section class="section-widget collections">
    <details class="section-widget-title-details" title="Expand if you want to access more options.">
        <summary class="section-title-summary">
            <h2>{{ctitle}}</h2>
            {{ icon('arrow-down', 'icon icon-details-open') | raw }}
        </summary>
        {% if has_collections %}
            <fieldset class="section-form">
                {{ form(add_form) }}
            </fieldset>

            <details class="section-widget-subtitle-details section-padding"
                     title="Expand if you want to access more options.">
                <summary class="section-subtitle-summary">
                    <strong>{% trans %}Other options{% endtrans %}</strong>
                    {{ icon('arrow-down', 'icon icon-details-close') | raw }}
                </summary>
                <fieldset class="section-form">
                    {{ form(create_form) }}
                </fieldset>
            </details>
        {% else %}
            <fieldset class="section-form">
                {{ form(create_form) }}
            </fieldset>
        {% endif %}
    </details>
</section>