[Dawn] How to automatically generate a menu that allows navigation within the same hierarchy from the main menu in the Shopify theme "Dawn"

If you set up Shopify's global menu to two or three levels, it can be a bit of a hassle to have to open the menu every time you want to move to the same level. So, in the Dawn theme, we'll show you how to automatically display submenus that make it easier to navigate between levels according to the menu structure.

How to automatically generate a menu that allows navigation within the same hierarchy from the main menu in the "Dawn" theme

[Setup Steps] Add a customized Liquid section to the header and insert the code