The bar fits itself

The links share one rounded capsule; the one under the pointer gets a soft pill of its own. Scroll down and the bar tightens up (Shrink when the page scrolls).

Try the others: Pill · Segmented · Underline glide · Dock · Neon

Set it in Content > Menus > (your navbar menu) > Behaviour > Bar shape, or for one page with [navbar bar="pill" /].