https://www.bleepingcomputer.com/news/microsoft/windows-10-1909-kb4532695-update-fixes-file-explorer-bugs/

Today's Windows 1909 cumulative update fixes some of the bugs that made File Explorer search unusable since the November 2019 Update was released, but there is still more room for improvement.

With the release of Windows 10 1909, otherwise known as the November 2019 Update, Microsoft integrated Windows Search into File Explorer.