Following these steps to create a menu.
Step 1 – Go to Sumi > Menu Builder.
Step 2 – Click Add new to create new Mega menu.
Step 3 – After create the new Mega Menu > Click “Edit” to build the Mega Menu follow your idea.
Step 4 – Go to Appearance > Menus > Edit Menus > Mega Builder and click to choose the Mega Menu which you want to use. Example: Shop.
Your site in front end will display like that: