Device Settings > Windows 11 Settings > Apps > Client apps > Mail clients – with contacts and calendar > New Outlook for Windows (was Mail) – with People and Calendar > New Outlook (was Mail) Calendar > Calendar Search – New Outlook (replacing old Mail app)

Calendar Search – New Outlook (replacing old Mail app)

Calendar Search – New Outlook (replacing old Mail app): Click in Search box at top and type the event e.g. dentist, then press Enter to complete the search