knowledge-8.x-1.x-dev/tests/modules/knowledge_display_configurable_test/knowledge_display_configurable_test.module

<?php

/**
 * @file
 * A module for testing making knowledge base fields' displays configurable.
 */

use Drupal\Core\Entity\EntityTypeInterface;

/**
 * Implements hook_entity_base_field_info_alter().
 */
function knowledge_display_configurable_test_entity_base_field_info_alter(&$base_field_definitions, EntityTypeInterface $entity_type) {
  if ($entity_type->id() == 'knowledge') {
    foreach (['created', 'uid'] as $field) {
      /** @var \Drupal\Core\Field\BaseFieldDefinition[] $base_field_definitions */
      $base_field_definitions[$field]->setDisplayConfigurable('view', TRUE);
    }
  }
}

/**
 * Implements hook_entity_type_build().
 */
function knowledge_display_configurable_test_entity_type_build(array &$entity_types) {
  // Allow skipping of extra preprocessing for configurable display.
  $entity_types['knowledge']->set('enable_base_field_custom_preprocess_skipping', TRUE);
}