This option has to working situation:
- If the menu item does have submenu, it’ll show/hide the submenu.
- If the menu item doesn’t have submenu, it allows you to add new submenu and add widget(s) to the submenu.
To access this option, click on menu that you want and select this option.
Add new column/row
You can add new column or row for a selected column/row 
You can group submenus of any menu item by selecting the menu item then enable option “Group”. 
Assign widget for new created column/row
Select each newly created column/row (aka. blank sub item), you’ll see the option to select or add widget. For selecting, only select from dropdown list. 
If you want to add new widget, select Add widget: 
A popup will display for you to select widget. Then just follow the option to create new widget for your menu item.
This option allow you to divide submenu into columns, just select the Position option to move menu item between columns. 
You can set a fixed width for each and every submenu:
For the column, our menu based on 12 columns grid so you can set each column a width of 1 ~ 12:
Each menu item can has its own icon. We only support Awesome Font icons and you can input the icon class or click the select link to choose icon from popup.
