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Also, the mobile version collapsing the zippies, which means search doesn't work.

On mobile wikipedia site go to hamburger icon - settings and then Expand all sections

Oh, nice, this is apparently a persistent setting too! Thanks!

What are "zippies"? I tried searching but couldn't find a relevant definition.

Sometimes called accordion menus. See: https://jqueryui.com/accordion/

On Wikipedia, the content section headers. More generally, expandable sections of a page that default to being collapsed.