Multisite OJS with multiple domain - crossed accessible/indexed articles

Hello!

We have a multisite OJS with many journals, but only 3 journals have own domain names.
OJS version: 3.3.0.20

Our problem is that practically all journal articles are accessible from all domains. This is not very convenient, as users can link an article using the URL of a different journal from another domain. However, the issue has escalated to the point where Google has indexed the same article under 2-3 different domains. As a result, an article may appear (based on the URL) as if it was published in a different journal rather than its own.

For example, we have a published article under the correct domain:

https://domain/index.php/journal1/article/view/45778

but we can reach it under other domains too:

https://domain2/index.php/journal1/article/view/45778
https:// domain3/index.php/ journal1/article/view/45778

We also checked the journal’s sitemap (because the indexing problem), but its seemed fine for me. I only found the article URL on that sitemap of the journal, where the article originally was published.

Is there a way to ensure that journal pages are only accessible from their own respective domains?

Thank you in advance for your answer.
Have a nice day.
Best regards, Tiffany Fülöp