Gives every site a search page at /search/ without creating one, and a better search form everywhere. The search page is generated on the fly, so there is nothing to set up and the search slug cannot be taken by an ordinary page.
Search forms gain a dropdown for choosing what to search, all content or a single post type, both in the classic search form and in the core Search block used by block themes. Links to the search page open the search form in a dialog instead of loading a new page, and the page can be added to classic menus through LH Dynamic Menu Items.