Doesn't work in Avada theme

See Relevanssi with Avada. Does that help?

Thanks for the prompt reply, but the answer is no.
There’s no query_posts anywhere in the search.php, nor there are any other calls described on your site. Avada released a new version just yesterday, so it seems that your workaround needs an update too.

Unfortunately I have no access to the Avada theme, so I can’t help you with that.