Have you read the release notes?
There are a few issues with the search.
Search:
- After clicking the Search icon on the Taskbar, the Search panel may not open. If this occurs, restart the “Windows Explorer” process, and open the search panel again.
- When you hover your mouse over the Search icon on the Taskbar, recent searches may not be displayed. To work around the issue, restart your PC.
- Search panel might appear as black and not display any content below the search box.