The easiest way to do this is to use a hook (the
pre_get_posts hook) to change the order. But you should check that the query is one for which you do want to alter the order! (
is_post_type_archive() should be sufficient.)
For instance, put the following in your theme’s functions.php file.
add_action( 'pre_get_posts', 'my_change_sort_order');
//If you wanted it for the archive of a custom post type use: is_post_type_archive( $post_type )
//Set the order ASC or DESC
$query->set( 'order', 'ASC' );
//Set the orderby
$query->set( 'orderby', 'title' );
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