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

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

{% block field %}
    {% embed 'forms/default/fields.html.twig' with {name: name, fields: field.fields} %}
        {% block outer_markup_field_open %}<div class="form-column block pure-u-1-{{ cols }}">{% endblock %}
        {% block outer_markup_field_close %}</div>{% endblock %}
    {% endembed %}
{% endblock %}