hehe/user/plugins/form/templates/forms/fields/fieldset/fieldset.html.twig

{% set scope = field.nest_id ? scope ~ field.name ~ '.' : scope %}
<fieldset {% if field.id is defined %}id="{{ field.id }}"{% endif %} {% if field.classes is defined %}class="{{ field.classes }}" {% endif %}>
{% if field.legend %}
    <legend>{% if grav.twig.twig.filters['tu'] is defined %}{{ field.legend|tu }}{% else %}{{ field.legend|t }}{% endif %}</legend>
{% endif %}

{% if field.fields %}
    {% for field in field.fields %}
        {% if field.type %}
            {% set value = form.value(field.name) %}
            {% include ["forms/fields/#{field.type}/#{field.type}.html.twig", 'forms/fields/text/text.html.twig'] %}
        {% endif %}
    {% endfor %}
{% endif %}
</fieldset>