Tutorial here.
Ignore the part that references Tagalong. That was the legacy add-on. The settings are under the Categories panel if you have downloaded and activated the Power add-on/
Docs site for single parent and Hierarchy settings
For results use the field slug. Using Extended Data Manager you can determine if its Boolean or text. You can manage which fields are shown, hidden, their data types, and other attributes of extended location data element via the Manage Extended Data Elements group under the General / Data tab.
https://docs.storelocatorplus.com/blog/extended-data-manager/
https://docs.storelocatorplus.com/blog/data-fields-to-display-in-results/
Since I do not know what versions you have , (Please always post your plugin environment per the Posting guidelines. Your plugin environment is under the INFO tab in WP SLP)