[Drupal8] make user field configurable in comment

expose_author_uid.php

<?php

/**
 * Implements hook_entity_base_field_info_alter().
 */
function mymodule_entity_base_field_info_alter(&$fields, EntityTypeInterface $entity_type) {
  switch ($entity_type->id()) {
    case 'comment':
      $fields['uid']->setDisplayConfigurable('view', TRUE);
      break;
  }
}