Content Rollup - Content Search not showing subsites

On-prem sharepoint server, I have a site URL at http://company/sites/collaboration with subsites that different users have different membership access to.

On the main site here if I add a web part for Content Rollup > Content Search no matter what I do the search results don't show sites. 

I've tried query:

path:"http://company/sites/collaboration" contentclass:{Site.URL} and other things but nothing.