In Edit Mode you can display a sample menu which reflects all the subsequent settings.
General Settings
Display Child Pages - turns on or off the display of child pages. I.e. if switched off, only parent pages will be shown
Remove Links From Parents - if Display Child Pages is selected, this setting will remove links from parent pages so that the parent page will simply be a link to the underlying structure
Indent - determines by how much child pages are indented to their parent
Collapsible Child Pages - makes child pages collapsible instead of statically displaying them
Marker Type - select a marker to display in front of each entry. You can select "None" for no marker
Style
Dropdown Icon - has two color selectors: Open sets the color of the dropdown icon for open submenus; Closed sets the color of the dropdown icon for closed submenus
Custom Link Color: opens the color selector for links
Extra
Font Set, Style Set and Cust. CSS Class - open up the advanced features of the Font and Style stacks.
Menu Item Settings
Nested - if this option is selected, the menu item can be nested, i.e. contain submenus
Link - provides the facility to add a link to the menu item