add_filter( 'woocommerce_get_catalog_ordering_args', 'mihanwp_sort_by_stock', 9999 );
function mihanwp_sort_by_stock( $args ) {
$args['orderby'] = 'meta_value';
$args['order'] = 'ASC';
$args['meta_key'] = '_stock_status';
return $args;
}
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