Manual:$wgVectorResponsive

From Linux Web Expert

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

Details

Improves the user experience for the Skin: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.