4 sites 2 languages

Hi I have 2 sites in 2 languages each so I would like to link only the corresponding site-language but if I am in a page of site #2 and I link to its translation page, it will also link to the translation page of site #1, even if I manually unselect it it will always come back. They have the same slug and title but it would move the user to a different content.

Thank you!

https://ww.wp.xz.cn/plugins/multisite-language-switcher/