public function submitForm(array &$form, FormStateInterface $form_state) {
$this
->config('tmgmt.settings')
->set('quick_checkout', $form_state
->getValue('tmgmt_quick_checkout'))
->set('purge_finished', $form_state
->getValue('tmgmt_purge_finished'))
->set('anonymous_access', $form_state
->getValue('tmgmt_anonymous_access'))
->set('respect_text_format', $form_state
->getValue('respect_text_format'))
->set('allowed_formats', array_keys(array_filter($form_state
->getValue('allowed_formats'))))
->set('submit_job_item_on_cron', $form_state
->getValue('tmgmt_submit_job_item_on_cron'))
->set('job_items_cron_limit', $form_state
->getValue('job_items_cron_limit'))
->set('file_mimetypes', array_values(array_filter($form_state
->getValue('mimetypes', []))))
->save();
parent::submitForm($form, $form_state);
}