The Main menu is the menu on the Header. In this tutorial, we will show you how to set up the header menu and configure it like our demo. You can use this guide to set up your menu.
To configure the menu on the header, you must first create a menu. From Your Shopify Admin > Online Store > Navigation > Add Menu. (Please see photo #1).
In the demo, we create up to 3 levels for a menu (Please see photo #2)
After creating the menu, leave the custom page and click on the Header Section (First section at the top). The customization panel of this section is on the right-hand side.
In the Custom Header panel, please scroll down, and you will see the "HEADER MENU" setting; please add the menu you just created here (Photo #3).
At the HEADER -> click + Add block.
Select Megamenu Item block.
In the Megamenu Item block, there are items: menu, image, list collection, and product. You can customize it however you want.