[[MediaWiki:vector-collapsiblenav-preference/en]]

This is a very confusing option in preferences->"appeareance": "Enable collapsible left navigation menu". First, it should say something like "Enable collapsing in the left navigation menu". Second, it only applies to Vector skin, so it should mention it, unless devs are about to make this option disappear in other skins.

I think this setting is only visible when using Vector skin, so it shouldn't be a problem. I'll check with a developer.

Alex is right, this preference is always visible regardless of skin and could do with some clarification.

Is it possible to make it visible in vector skin only?

Don't known/don't care from an i18n perspective. If you want to discuss that, please do that elsewhere, like in bugzilla.

 Done mwr:67899.