You can follow the continuous guidance in the clip version about how to customize the verticle mega menu that has the same settings as the horizontal mega menu.
You can revise the information on the specific guidance below on how to customize the horizontal mega menu in case you missed any information on the clip.
I. Add Main Verticle Menu
Click on the Header section, scroll down to the Horizontal menu settings and select the menu you want. You can edit that menu by clicking on the Edit menu under its title, then you'll be moved to the Shopify admin - Navigation to edit its menu. After editing the menu successfully, you turn back to the store settings and we suggest that you should reload the page to update the changes to the menu.
Or you can edit the menu or create a new horizontal menu by logging in to your Shopify admin directly > click on Online Store > then select Navigation option under > you can add a new menu or select the existing menu to edit
II. Verticle Menu settings
1. Trigger Navigation
In Menu settings at the Header section, click on the Horizontal Mega Menu to add blocks
Select Trigger Navigation to add it to the horizontal mega menu
Title:Please enter the exact title of the menu in your admin that you want to add to the mega menu. E.x: Shop,Portfolio,..
Background image: click on the select image to upload the one you want to be set for the background of this whole section
Choose an option from each field under to modify the image background
Moreover, you can create the menu list, multiple product, image, banner, single product for that menu. Be noted to place those blocks under the trigger navigation
2. Menu list
Click on the "Add block" to add the Menu list to the trigger navigation
Block title: enter the title for this block
Menu: press the button to choose the existing menu, then you can change, remove, or edit that menu.
Width: drag to set the width for the block
3. Multiple product
Block Title: give it title for this block
Title: give a title for this multiple product menu
Link: click on the box to paste or search a link
Width: drag to modify the width for this block
You can choose the menu to upload on the product 1 and product 2 to display
This block is not working on Mobile
Image: Choose an image to show
Width: and drag to adjust the width for this image block
Link: paste or search an available link
Title: Input a title for the banner,
Background color: choose a color for the background by using the color picker
Width: drag to change the width for this banner section
Image: Select an image to show
Insert contents for text 1 and text 2
Label: Enter the name of the label button, Eg: View Details
Link: Paste a link or search it from the existing menu
Style: drag to choose a button style from 1 to 3
Image: select the image to display
Text: enter the text to the box
Link: paste or search a link to attach it to the image
6. Single product
Title: give this block a title
Width: drag to adjust the block width
Product: choose a product to show and drag to adjust the width between the products.
Please click Save on the top right of the screen to save the changes that you just input.