protected function actions(array $form, FormStateInterface $form_state) {
$form = parent::actions($form, $form_state);
// We want to display the button only on add page.
if ($this->entity
->isNew() && $this->moduleHandler
->moduleExists('field_ui')) {
$form['submit']['#value'] = $this
->t('Save and manage fields');
}
return $form;
}