On the Available Refinements component, end users may use either a list of values or a range filter to select the refinement.
Some attributes, such as string attributes, are restricted to the value list selection type. For these attributes, the selection type is displayed as a text string next to the attribute.
However, if an attribute can support either selection type, then a drop-down list is displayed for you to select the type to use.
For numeric and date/time attributes, the selection mode defaults to use a range filter.

Note that when a date/time attribute is configured to use the range filter option, the range filter is only used for the date/time subsets that can support it. For example, the Month subset is always displayed as a value list.