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Go in the Values Tab to define a label for the facet and click on the "force include" checkbox, otherwise, the facet will not be added unless requested by the e-shop. All the other parameters are optional and affect the display of the facet. The most important ones are the Order (smallest number first, you can set negative values to force a facet on top), the Display Type (should it appear collapsed or already expanded), The Value Order (Alphabetical or per Counter) and Show Counter (if you want to see the counter next to each facet value). For more information about the other options, please refer to our documentation.
After When you are finished with your changes, click the 'Test' Button and, after the confirmation dialog appears, test your facets in your stage web-site (assuming it is connected to the current account dev index). When all is tested, you can publish the changes in the Publishing viewbefore publishing.