Hello Aubrey!

I will create a Sitemap as an example for you to understand:

Home Page
- Menu
        Page 1
   -   Level 1
       Separator1
       Page 2
       Page 3
       Separator 4
       Page 5
       Page 6
       Separator 7
       Page 8
       Page 9

Once this has been done, go into Step4 - Advanced Settings - Drop Down menu and choose the ''Arange in more columns'' option from the menu type list and hit on ''ok''.
Now, you can test your preview and you will find that the menu is exaclty what you are looking for!