How do I add a mega menu to my Shopify store?

Three routes. Some premium themes include a mega-menu out of the box — check your theme settings first. If not, a mega-menu app is the quick no-code option, though it adds scripts. The cleanest is a custom mega-menu coded into the theme: fast, fully on-brand, and no third-party dependency.

For a large catalog, also think about the structure, not just the widget — group collections logically, surface your best sellers, and keep it usable on mobile (mega menus often break down on small screens if not designed for it). The nav is prime real estate; it's worth doing properly.