Microsoft is rolling out new preview builds of Windows 11 this week that introduce yet another big update to the File Explorer app. Today's Dev Channel build is 23451 and features a new, modern details pane view that provides details on a file when the user single-clicks on an item within File Explorer.

source https://www.windowscentral.com/software-apps/windows-11/microsoft-is-modernizing-more-parts-of-the-file-explorer-on-windows-11