simple-page-attributes-taxonomy.php

function add_page_attributes_taxonomy() {
    $args = array(
      'label'        => __( 'Page Attributes', 'textdomain' ),
      'public'       => false,
      'rewrite'      => false,
      'hierarchical' => false,
      'show_ui'      => true,
      'show_in_quick_edit' => true, // Added this line to show in Quick Edit
      'show_admin_column'  => true,
    );

    register_taxonomy( 'page_attributes', 'page', $args );
}

add_action( 'init', 'add_page_attributes_taxonomy' );