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Hi @atoweb
Thank you for using Filter Everything.
In general such feature is available in the PRO version, where you have option “Hide empty Filters”.
But in Free version you can use hook wpc_view_include_filename and function flrt_is_filter_request(); to control what filter template to include and to check if current page is filtering results page. And if filter does not contain terms you can include empty PHP file that displays nothing to hide such empty filters.