Search using searchbar

By default the search bar uses your browser's own search engine.

The search bar at the top of the new tab

The search bar with its search engine button

If you want to use another supported search engine (Google, DuckDuckGo or Bing), just choose one from the dropdown next to the search bar.

The search engine dropdown next to the search bar

This setting is not synchronized; it is remembered only in the browser where you set it.