/**
* {@inheritdoc}
*/
public function buildOptionsForm(&$form, FormStateInterface $form_state)
{
parent::buildOptionsForm($form, $form_state);
$form['expose']['hide_single_bundle'] = ['#type' => 'checkbox', '#title' => t('Hide if there\'s only one bundle.'), '#default_value' => $this->options['expose']['hide_single_bundle']];
}
