public function buildOptionsForm(&$form, FormStateInterface $form_state) {
parent::buildOptionsForm($form, $form_state);
$form['expose']['hide_no_continuous'] = [
'#type' => 'checkbox',
'#title' => t('Hide this filter if there are no continuous jobs.'),
'#default_value' => $this->options['expose']['hide_no_continuous'],
];
}