SonataAdminBundle/Resources/views/CRUD/list__action_view.html.twig

{% if admin.hasRoute('show') %}
    <a href="{{ admin.generateObjectUrl('show', object) }}" class="view_link" title="{% trans from 'SonataAdminBundle' %}action_show{% endtrans %}">
        <img src="{{ asset('bundles/sonataadmin/famfamfam/magnifier.png') }}" alt="{% trans from 'SonataAdminBundle' %}action_show{% endtrans %}" />
    </a>
{% endif %}