Dropdown menus are set up through the Navigation page in your Shopify admin area.
1. First, you’ll want to create a link titled Catalog (under the Main Menu link list).
2. Then, create a new link list called Catalog.
3. Finally, populate the new Catalog link list with links that point to particular product collections, products, pages, or blogs.
Note: You don’t have to use “Catalog” — you can swap that for any word!
If you’re looking for instructions on how to set up Editions’ mega-navigation system, head on over here.