Here is the anatomy of tracking an internal site search within Matomo:
The internal site search results refers to the number 100 here.
This figure will show up within the log visit report when hovering your mouse on the search term BUT it will show nowhere within the archive reports.
The expected behavior would be to find it within the site search report as a metric column.
Currently, we only use this "site search results count" (3rd parameter) for populating the report "Search Keywords with No Results". Therefore it is expected that this number doesn't show in the reports so far (by design). Thanks for creating the issue.