Once you make a collection, it is live on site by default, however it will be hidden from your menu until you define it in the navigation section.
Click on the menu you want to add the collection or page to
Select “Add Menu Item” to relevant heading Click on “Search or paste a link” Find the collection you want to add The name will automatically fill out with that collection name once that collection is selected, but you can change it to anything you want. Note that the collection name will stay the same on the collection page, so it’s best to keep it consistent.
Adding sections
If you want to add a section to your mega menu, create a menu item at the top level by scrolling to the bottom of the page and selecting “Add Menu Item” Drag collections below it to coordinate hierarchy.