If I tick "Hide page from search engines" on - then it is because I want the page published but also hidden. Like a thank you page.

But the Hide page from search engines doesn't hide pages from the internal search - Please add this also, so we can avoid our thank you pages shows up in the search.

It would makes sense, I cannot be the only one to have a custom 404-page or a Thank you page I don't want to appear on the internal search page.