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

https://www.apollotechnical.com/how-to-remove-your-own-site-from-google-search-results/

If you need to hide pages from search results, use the right tool for the job. Add a "noindex" tag to the page code for a clean, permanent removal. If you need it gone immediately, use the Google Search Console Removals tool to hide it temporarily