List posts in random order

Hello,

If you are comfortable adding a little code into your theme the following code will make all category listing pages random:

function set_category_listings_random( $query ) {
    if( !is_admin() && $query->is_main_query() && is_category() ) {
        $query->set( 'orderby', 'rand' );
    }
}
add_action( 'pre_get_posts', 'set_category_listings_random' );

Each WordPress theme folder will have a file called functions.php inside of it. Make a copy of this file somewhere else in case something breaks and open the functions.php file with a text editor. Go to the bottom of the functions.php file and add the code above. Save and upload to your site.

You could also add this code through the theme editor in the WordPress admin screen. Just make sure to make a backup in case something goes wrong!

Good Luck!