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Hi @widepalermo
Thank you for your interest in Filter Everything.
Yes, the plugin is working with the toolset custom fields.
You can check the quick start guide – https://filtereverything.pro/resources/quickstart/ to understand how to set up and display the filter widget, in the “where to filter” dropdown you should specify your page and in “and what to filter” you should choose correct WP_Query.
Best Regards – Victor.