ViewEditForm::submitDisplayEnable

public ViewEditForm::submitDisplayEnable($form, FormStateInterface $form_state)

public function submitDisplayEnable($form, FormStateInterface $form_state) {
  $view = $this->entity;
  $id = $form_state->get('display_id');
  // setOption doesn't work because this would might affect upper displays
  $view->getExecutable()->displayHandlers->get($id)->setOption('enabled', TRUE);

  // Store in cache
  $view->cacheSet();

  // Redirect to the top-level edit page.
  $form_state->setRedirect('entity.view.edit_display_form', array(
    'view' => $view->id(),
    'display_id' => $id,
  ));
}