https://www.bleepingcomputer.com/news/microsoft/microsoft-tests-new-windows-11-desktop-search-that-only-uses-edge-bing/

Microsoft is testing a new feature in the latest Windows 11 preview build that displays an Internet search box directly on the desktop. The problem is that it does not honor your default browser and only uses Bing and Microsoft Edge instead.

This new feature is currently being tested with a small subset of Windows Insiders running the Windows 11 build 25120 on the 'Dev' channel.