Board Thread:Support Requests - Designing Your Wiki/@comment-5558012-20161119013910/@comment-5501257-20161119034643

You should not put the class (.ns-0) of parent element (body) behind the child element (.refpopups-configure-page)

Try this instead body:not(.ns-0):not(.ns-4) .refpopups-configure-page { display: none; }