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The facets that are configured can be previewed in the Preview tab of the Workbench.
More information about configuring facets can be found here: Facets
Fields for Facets
Fields that make the best facets are fields that have widespread coverage for most, or all, records. Some of the most common facets are
Category/Department
Price
Color
Rating
Help and Best Practices for Fields
Field Guidance: Facets
Fields and Facets … What’s the difference? Field v/s Facet