Grav-Admin-Plugin/themes/grav/templates/forms/fields/columns/columns.html.twig

{% extends "forms/field.html.twig" %}

{% block field %}
<div class="form-columns grid pure-g">
    {% set cols = field.fields|length %}
    {% include 'forms/default/fields.html.twig' with {name: field.name|parent_field, fields: field.fields, fallback_field: 'column', cols: cols} %}
</div>
{% endblock %}