Hi, I just noticed that in MediaWiki namespace, I can see "Add languages" link/section to add other languages or jump into them (as you can see in the image), but as far as I know and see in the legacy vector, we can't do that. So, we need to hide that section in MediaWiki namespace.
The image link: https://en.wikipedia.org/wiki/MediaWiki:Gadget-Twinkle?uselang=en&useskin=vector-2022&safemode=1