pma/templates/config/form_display/fieldset_top.twig

<fieldset
    {%- for key, value in attributes -%}
        {{- ' ' }}{{ key }}="{{ value }}"
    {%- endfor %}>
<legend>{{ title }}</legend>
{% if description is not empty %}
    <p>{{ description|raw }}</p>
{% endif %}
{# This must match with displayErrors() in scripts.js #}
{% if errors is iterable and errors|length > 0 %}
    <dl class="errors">
        {% for error in errors %}
            <dd>{{ error }}</dd>
        {% endfor %}
    </dl>
{% endif %}
<table width="100%" cellspacing="0">