Bar shape: Segmented

A tray with one raised thumb that slides to the link you point at and rests on the current page. Scroll down and the bar tightens up (Shrink when the page scrolls).

Try the others: Pill · Segmented · Underline glide · Dock · Neon · Tabs · Tiles · Bubbles · Brutalist · Gradient band

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