add_action( 'elementor/query/customquery', function( $query ) {
$query->set( 'post_parent', 1599); 


 } );
add_action( 'elementor/query/customquery_copages', function( $query ) {
	global $post;
	  $query->set( 'order', 'ASC' );
	$query->set( 'orderby', 'menu_order' );
	    $query->set( 'post_parent',  $post->ID );

 } );

Write like this inside function.php .You can select query