How to display the menu when Bitrix is ​​multi-site?

Question

1C-Bitrix

There are 2 domains: site.ru and old.site.rusite.ru and old.site.ru
Created 2 templates for each of them.
The site files are in the s1 and s2 directories.
When accessing site.ru, the .top.menu.php menu is displayed, when going to the site.ru/about page it is not displayed, on the site.ru/s1/about page the menu works.
The problem is only with the menu, all pages are displayed normally.
How can the problem be solved?

Answer 1

The site files are in the s1 and s2 directories.
When accessing site.ru

This is a very bad multisite - done crookedly.
You need to do at least this:
/home/bitrix/www/.top.menu.php
/home/bitrix/www/about/index.php
/home/bitrix/www/s2/.top.menu.php
/home/bitrix /www/s2/about/index.php
And then open the first site by site.ru (SITRE_DIR = /)
And in old.site.ru make SITE_DIR = /s2/
Or, in general, spread it into different folders:
/home/bitrix/www /* - first website
/home/bitrix/ext_www/s2/* - second
website

Answer 2

what do you have there in .top.menu.php? give me the code