Pins your theme's header to the top of the viewport so search, cart and navigation are always one click away. Choose whether it sticks immediately or only after the shopper has scrolled past a set number of pixels. An optional compact mode shrinks the padding and logo once pinned, so the header takes less of the screen on long category pages. Hide-on-scroll-down frees the whole viewport while the shopper reads and brings the header straight back the moment they scroll up. It targets the theme's own header element (with a CSS selector override for themes that use something else), measures its height and leaves a placeholder behind, so the page never jumps when the header detaches. All transitions honour the operating system's reduce-motion setting.