How to Enable Ascending or Descending In WordPress Default Built-in Loop

Question

Use the parse_query hook to override the default main query:

add_action( 'parse_query', function ( WP_Query $wp_query ) {
    /**
     * Only apply our custom ordering when:
     * - We're not in the admin
     * - It's an archive (i.e. not singular)
     * - It's the main query (won't affect custom WP_Query)
     */
    if ( ! is_admin() && ! $wp_query->is_singular() && $wp_query->is_main_query() ) {
        $wp_query->set( 'orderby', 'title' );
        $wp_query->set( 'order', 'DESC' );
    }
});

This needs to live in a plugin or your theme’s functions.php.