In this section you can find the menu content related settings. You can select which categories will be shown with the Categories as top level categories multiselect, and you can also select whether the products will also appear in the menu under their categories.
Parent item as link will create links to the parent menu-items as well, so you can reach the category pages. In this case use the arrow icons to open the sub-levels.
With the Display count of sub-items you can show a number next to the item, which will shown how many sub-items it have. There are 3 options available, the Yes only the real count means that only the direct sub-items will count. The Yes the aggregated count on each category will also count the sub-items in all category under the upper one. And you can also disable this feature.
Element order is a important parameter. With that you are able to change the order of your menu-items. Choosable options are Component Default, which means that if the component has an ordering for the items, that will work in the menu as well. The other 2 options are alphabetically ascend or descend.