Windows 11 Insider Build 25120 brings an experimental feature: a search box displayed on the desktop that enables you to search the web. With the Dev Channel, the company is now starting to test conceptual features that may not always make it to stable releases. ISOs are also available for this build, so you will be able to clean install. Just head over to this link to download.
Windows 11 Insider Build 25120: Changes and Improvements
Windows 11 Insider Preview Build 25120: Fixes
Windows 11 Build 25120: Known issues
For more details, head over to the official blog post. If you would like to remove this search box, you can right-click on the desktop, choose “Show more options,” and toggle the “Show search” option. We are excited to learn your feedback on this interaction model, so please use the Feedback Hub to provide feedback if you receive this experiment. NOTE: A reboot is required after updating to this build to trigger this experience but please note that not all Windows Insiders will have this experience enabled even after reboot.