How to Make the Header Sticky in Shopify Horizon Theme

Horizon has a native sticky header option — no custom code needed to keep navigation visible as shoppers scroll.

Steps

In your Shopify admin, go to Online Store > Themes and click Customize on Horizon.
Select the Header section.
Find the Sticky header setting and choose On scroll up (appears only when scrolling back up) or Always (stays visible at all times).
Click Save.

"On scroll up" tends to work better on mobile, where a permanently fixed header eats into an already small screen.