How to do SEO optimization for a multilingual site on MODX?

Question

MODX

Good afternoon colleagues. There is a website that has 5 language versions and they are available at the addresses: domain name.ru/ru/ domain name.ru/en/ domain
name.ru/fr/
and
so
on.
If you delete /ru/ in the address bar and leave the domain name, then a redirect to the domain name.ru/ru/ will occur. Everything is fine. But the question for PM (Yandex, Google) is how to make them index only addresses:
domain name.ru/ru/....
domain name.ru/en/....
and so on.
If you now enter the domain name in the search: domain name.ru, then the results will be: domain name.ru domain
name.ru/ru/
and
so on.
Total: how to prohibit indexing just the domain namedomain.ru.
When switching to it, there is a redirect to the domain name.ru/ru/