https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Entity%21EntityManager.php/function/EntityManager%3A%3AgetFormDisplay/8.9.x
function EntityManager::getFormDisplay | Drupal API
functionentitymanagerdrupalapi
https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Entity%21ContentEntityFormInterface.php/function/ContentEntityFormInterface%3A%3AgetFormDisplay/10
function ContentEntityFormInterface::getFormDisplay | Drupal API
functiondrupalapi