Hello,
Thank you very much for choosing our theme and for contacting us.
Megamenu blocks are created in HTML blocks (custom post type allowing create any template by means of a builder) Please find more details here: https://xtemos.com/docs/woodmart/html-blocks-2/
You can create any template: divide the row/sections into the number of columns, insert an image, then title elements, and then Extra menu list – https://xtemos.com/docs/woodmart/shortcodes-2/
If you have any questions please feel free to contact us.
Best Regards