The new feature appears in Windows 10 build 17040, but it’s not enabled by default. However, if you’re an Insider, you can give it a try editing the Registry.
In this guide, you’ll learn the steps to enable the new floating search on Windows 10 build 17040.
How to enable floating Cortana experience
Use the Windows key + R keyboard shortcut to open the Run command.
Type regedit, and click OK to open the Registry.
Browse the following path:
Right-click the Flighting (folder) key, select New, and click on Key.
Name the key Override and press Enter.
Right-click the “Override” key, select Key, and select DWORD (32-bit) Value.
Name the DWORD ImmersiveSearch and press Enter.
Double-click the “ImmersiveSearch” DWORD and make sure to change its value from 0 to 1.
Once you’ve completed the steps, right-click the Taskbar, select Cortana, and click the Show Cortana icon option. Then you can click the Cortana button, and the new floating search bar experience should open up in the desktop.