A frequently asked question is if it is possible to show all facet choices (for example all terms in a taxonomy), also if there are no results for some of those choices.

The answer is no; FacetWP only indexes and displays facet choices that have results.

Note that some facet types (like Checkboxes, Radio and fSelect) have a “Show ghosts” setting, which will show “ghost” (dimmed) choices if there are no results for them. But the same applies for these ghost choices: they need to appear in the unfiltered results, and can only become ghosts after being filtered out. If a facet choice has no associated posts, then it will never appear.

See also