Manual:$wgVectorResponsive

Skins: $wgVectorResponsive
Make Vector more responsive.
Introduced in version:1.26.0 (Gerrit change 220667; git #cec2337a)
Removed in version:Still in use
Allowed values:(boolean)
Default value:false

Details

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MediaWiki versions:
1.26 – 1.35

Improves the user experience for the Vector skin on low-resolution displays. Essentially places the navigation menu below the content, instead of to the side of it. Also hides the logo, as there's no space left for it.

MediaWiki versions:
1.36 – 1.37

The setting only works in Vector v2; that is, $wgVectorDefaultSkinVersion must be set to 2 (which is the default).

MediaWiki version:
1.38

The setting works on both vector-2022 and vector, however since responsive.less has been since removed, the improvements to vector from before 1.36 are no longer there.