In this episode, Tyler demonstrates how to change Safari's default search engine on iOS, iPadOS, and macOS.
To do this on iOS and iPadOS, go to Settings > Safari and double-tap "Search engine" to specify the search engine for standard browsing windows, or "private search engine" if you want to specify a different search engine to be used in private browsing windows. On macOS, in Safari, choose Safari > Settings (or press Command-Comma) click the Search button in the toolbar, and choose from the "Search engine" or "private browsing search engine" popup menus.