The header is prime real estate for navigation tools and Grid offers various options for this key feature of your storefront.
Use the Navigation admin
Go to Online store > Navigation. Here, you’ll find two pre-populated menus: Main menu and Footer menu. You can edit the links in these menus by clicking on the titles to edit them, or create additional menus by clicking the indigo Add menu button.
Connect the menus with the header
Back in the theme editor, under Header > Navigation, connect your menu to your header. By default, it will display the Main menu, but you can connect any menu you create from the Menu dropdown.
Activate a mega menu
Click the toggle beside Header in the left sidebar to open the Mega menu block.
Add more by selecting (+) Add Mega menu.
Choose the menu item with the nested dropdown and add its title to the Menu item. For example, if a menu item is 'Shop', then Shop would be added to the Menu item field.
Display an image in your mega navigation
Add a Featured image (480 x 1000px JPG or PNG image). This will display to the left of the menu links in your mega navigation menu.