Delete shared notes on iCloud.com
Go to icloud.com/notes, then sign in to your Apple Account (if necessary).
Select the shared note that you want to delete.
If you do not see the notes list, see Show the folder or notes list in Notes on iCloud.com.
Tap
in the Notes toolbar, then tap OK.One of the following happens:
If you are the owner: the note is removed from the devices of everyone you shared it with. You can recover your recently deleted notes from your Recently Deleted folder.
If you are a participant: the note is removed from your notes list, but not from the owner’s notes list or any other participant’s notes list. The note does not move to your Recently Deleted folder. You can open and edit the note again by tapping the original link that the owner shared, unless the owner has stopped sharing the note.