/** * {@inheritdoc} */ public function submitForm(array &$form, FormStateInterface $form_state) { // Toggle the flag state. if ($this->flag->isEnabled()) { $this->flag->disable(); } else { $this->flag->enable(); } // Save The flag entity. $this->flag->save(); // Redirect to the flag admin page. $form_state->setRedirect('entity.flag.collection'); }