Bar shape: Dock

The links swell as the pointer passes over them, like a dock. 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="dock" /].