If you need to hide pages from search results, use the right tool for the job....

https://www.pfdbookmark.win/to-remove-pages-from-google-results-use-the-noindex-meta-tag-on-the-specific

If you need to hide pages from search results, use the right tool for the job. Add a "noindex" meta tag to tell Google to drop the page from its index during the next crawl