core/Fields/Definitions/templates/sidebarselect/default.twig
{% extends Form.getLayout() %}
{% block fieldmarkup %}
<select id='{{ Form.getInputFieldId() }}' name='{{ Form.getFieldName() }}'>
{% if (Field.getArg('empty', true)) %}
<option value='' name=''>Bitte wählen</option>
{% endif %}
{% for o in sidebars %}
<option {% if (Field.getValue() == o.id) %} selected="selected" {% endif %} value='{{ o.id }}'>{{ o.name }}</option>
{% endfor %}
</select>
{% endblock %}