In the old days (Windows 10 version 1803 and earlier), you had to download an MSI file. Later, it became an "Optional Feature." On Windows 11, it is still an optional feature, but the discoverability is poor.
With the transition to Windows 11, IT administrators and helpdesk professionals frequently discover that the snap-in is missing by default. Unlike older versions of Windows where management tools were easily accessible via "Turn Windows features on or off," Windows 11 requires the manual installation of the Remote Server Administration Tools (RSAT) package.