Delete shared albums from iCloud for Windows
With iCloud for Windows, you can remove a shared album you created by deleting it. You can remove shared albums you subscribe to by unsubscribing.
On your Windows computer, open Shared Albums.
Right-click the shared album you want to remove and choose “Delete shared album” (if you’re the owner) or Unsubscribe (if you’re a subscriber) from the shortcut menu that appears.
When you delete a shared album you own, it’s removed from all your devices and the devices of all its subscribers. When you unsubscribe from an album, it’s removed from all your devices.