The menu widget popup asks you to choose your menu structure, its display type and how you would like it to be horizontally aligned inside its column.
1. Menu structure
You can create as many menu structures as you like in “ProPhoto > Customizer > Menus > “Menu Builder”. Each time you add a menu widget you choose exactly which structure (or, group of links) you want to use.
2. Menu display type
Every menu can be displayed either horizontally or vertically.
3. Horizontal alignment
Both vertical and horizontal menus can be aligned left, right or center.