Gutenberg

By default, Gutenberg is disabled. You can enable it from the theme options. If you still need Gutenberg disabled, but enabled only for simple posts, use the code below:

// Enable Gutenberg only for simple posts
if (is_admin()) {
  function enable_gutenberg_for_posts_only($use_block_editor, $post) {
    if (is_object($post)) {
      $post_type = get_post_type($post);
    } else {
      $screen = get_current_screen();
      $post_type = $screen ? $screen->post_type : null;
    }
    if ($post_type === 'post') {
      remove_filter('use_block_editor_for_post', '__return_false', 10);
      return true;
    }
    return false;
  }
  add_filter('use_block_editor_for_post', 'enable_gutenberg_for_posts_only', 99, 2);
  add_filter('use_block_editor_for_post_type', 'enable_gutenberg_for_posts_only', 99, 2);
}