Select from the list of available fields to use them as key filters for this list. Selected fields will appear underneath ...

Select from the list of available fields to use them as key filters for this list.  Selected fields will appear underneath the Site Hierarchy tree when viewing items in this list.  You can use these fields to filter your current view to show only items matching that value.

Fields that are available for use as navigation hierarchies include columns on this list that are one of the following types:
- Content Type
- Choice Field
- Managed Metadata Field
- Person or Group Field
- Date and Time Field
- Number Field