/**
 * Implements hook_entity_form_display_alter().
 */
function {{ machine_name }}_entity_form_display_alter(\Drupal\Core\Entity\Display\EntityFormDisplayInterface $form_display, array $context) {
  // Hide the 'user_picture' field from the register form.
  if ($context['entity_type'] == 'user' && $context['form_mode'] == 'register') {
    $form_display->setComponent('user_picture', [
      'region' => 'hidden',
    ]);
  }
}