Whether to use the current value as the subtitle.
If you use a custom list item factory, you will need to give the row a name conversion expression with property@ComboRow:expression.
If set to TRUE, you should not access property@ActionRow:subtitle.
The subtitle is interpreted as Pango markup if property@PreferencesRow:use-markup is set to TRUE.
Builder instance for fluent chaining
Set useSubtitle property.