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<?php
/* "ignore_custom_sort" => true to query args and use menu order instead */

return array(
"post_type" => "post",
"post_status" => "publish",
"orderby" => "menu_order",
"order" => "ASC",
"posts_per_page" => 10,
"ignore_custom_sort" => true
);

<?php

add_filter( 'facetwp_sort_options', function( $options, $params ) {
  $options['default']['query_args'] = array(
            'orderby' => 'menu_order',
            'order' => 'ASC',
        );
    return $options;
}, 10, 2 );