If you need to hide pages from search results, start by adding a "noindex" tag...

https://online-wiki.win/index.php/Should_I_Block_a_Page_Behind_a_Login_to_Remove_It_From_Google%3F

If you need to hide pages from search results, start by adding a "noindex" tag to the page header. This tells Google to drop the content from its index while keeping the page active for visitors