Add a checkbox to exclude pages/posts from the search

To exclude a page or post from the search result page you can simply use the pre_get_posts filter. But you can customize it more by adding a checkbox on pages/posts and then simply enabling the search result exclusion from the page/post itself.

Simply copy the code into the website child theme or code-snippet plugin. Once you enable it on any page or post it will be excluded from the results page.