{% set role = products|length == 5 ? 'grid-item' : '' %}

<div class="grid">
    {% for product in products %}
        <div class="{{ columns|default('g-col-12 g-col-md-6 g-col-lg-3') }} {{ loop.first and products|length == 5 ? 'g-row-lg-2 g-col-lg-6' : '' }}">
            {% include '@SyliusShop/Product/_box.html.twig' with {role} %}
        </div>
    {% endfor %}
</div>