Instead of filtering the list as it used to, it now shows a dropdown list with truncated one-line entries. That's the default `Edit -> Search`
For no reason other than they don't understand what UX is anymore they now have `Edit -> Find` that behaves almost like the previous version's search did.
You're talking about the autocomplete. If you want to finish a search and keep the list filtered, hit cmd+enter. Or use the global search (cmd+shft+space) to operate on live autocomplete results with keyboard shortcuts like a launcher app.