Microsoft is rolling out a new Windows 11 preview build for Insiders in the Beta Channel that brings with it an updated Task Manager app that features a new search bar along the top, along with general UI improvements to keep it consistent with the rest of the Windows 11 design language.

source https://www.windowscentral.com/software-apps/windows-11/latest-windows-11-preview-build-brings-search-to-the-task-manager-app