For Windows 10 v1909 some minor bugs were introduced into new version File Explorer search.  Based on recent developments it is projected Microsoft will fix these issues in early 2020

https://www.bleepingcomputer.com/news/microsoft/windows-10-file-explorer-bugs-to-be-fixed-after-holidays/

With this new feature, new bugs were also introduced that cause File Explorer to hang, the search box to become blurry, the search field to become unresponsive, and takes away the ability to right-click in the search field.

In the release notes for the Windows 10 Insider build 19013 released in November, Microsoft states that they have fixed the bug making the File Explorer’s search box unclickable.  In the release notes for Windows 10 Insider build 19536 released in December, Microsoft also states that they are making it possible to right-click in the search field to remove entries.