I try to reorder menu items by setting page order into Dashboard/Pages/Quick Edit, also i try plugin called ‘my page orders’, but anyway menu items was sorted alphabetically by page title, so i started to dig deeper.
In my template ‘top menu’ generated by function ‘wp_nav_menu‘ placed into header.php. When i looked at template, i saw that in parameters specified  ‘fallback_cb‘ function defined in function.php. When i found this function, i saw that this function uses ‘get_pages‘ with default arguments to get pages, so i just define 'sort_column' now function looks like get_pages(array( ‘sort_column’ => ‘menu_order’))
After that modification pages in menu sorted by as i expected.