How to adjust display of listings in the search results page (Directory Theme)

Hello Community, I have the problem that in the admin section of the latest Directory theme the option to adjust search results page is not yet implemented (greyed out).
I need to adjust the content of the listing on the search results page after the search was performed.
All found listings are listed up. Left the picture, right the rating and more details, and in the center of each of the listings is the company name and the address and the short description. But I want also show in these listings some additional fields e.g. telephone, website. Where do I find the file to adjust that I can add some extra fields to display. I tried to find it but without success.

I don’t mean the single listing (which I successfully adjusted already). I mean the listings in the search results page.