How to Add a Mega Menu in Shopify Horizon Theme

Horizon's mega menu goes further than older themes — because dropdown columns are built from nested blocks, you can drop images, promo tiles, or featured collections directly inside a menu dropdown, not just links.

Steps

1. In your Shopify admin, go to Online Store > Navigation.
2. Open the menu used by your header (commonly "Main menu") and add nested links to build the dropdown structure.
3. In Online Store > Themes > Customize, select the Header section.
4. Find the menu block for the dropdown you want to enhance, and use Add block inside it to add an image, promo, or featured-collection block alongside the plain links.
5. Click Save.

Keep top-level categories broad and let the nested links and blocks carry the detail — a mega menu with too many top-level items becomes harder to scan than a simple dropdown.