Customize SearchWP's main search query ORDER BY explicitly

gistfile1.php

<?php

// order by Post ID descending
function my_searchwp_query_orderby( $sql, $engine ) {
	global $wpdb;
	
	return "ORDER BY {$wpdb->prefix}posts.ID DESC";
}

add_filter( 'searchwp_query_orderby', 'my_searchwp_query_orderby', 10, 2 );