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My workaround for this would be to create a custom field "no_nuts" that would get the value of 1 if there are no nuts in the recipe. Then FacetWP would easily be able to pick it up, and you could just display it as a checkbox with a display of "No nuts" under an "Allergies" section of your filters.
If you have two fields you could then have one for positive filtering and one for negative filtering.
If colors were used like red and green it might make it easy to understand. A label with a plus and minus mark (SVG we can choose) there would be good.
Thanks for looking into this further, and thank you all for your recommendations.
I will look at your suggestions and see if we can make that work.
Here's an example: cargurus.com
There are a few "hide results with" fields in the left menu.
Do you have any examples (URLs) of recipe sites using negative filtering?
Also looking for any and all UI/UX guidance on this.
It would be really important that users could easily distinguish between a "normal" and a "negative" facet.