Hi Bill,
We don't have a built-in function to directly exclude "Created By" and "Modify By" while performing the search in a SharePoint Online list. "Created by" and "Modify By" are out of box columns in every list. Even if we remove the crawled properties from the search crawl, these properties exits and will show up in the list view. For your reference: Exclude created by / modified by .
Given this situation, we recommend you Submit Feedback to our related team. Many features have been designed or upgraded based on our customers' great comments. We appreciate your understanding and time.
Best Regards,
Alice