Below excerpt from the link below
View notes and locked notes on iCloud.com - Apple Support (CA)
View and close locked notes
You can view notes you locked on an iPhone, iPad, iPod touch, or Mac that’s signed in with the same Apple ID.
In Notes on iCloud.com, do either of the following:
- View locked notes: Select a locked note in the list, then enter the password you created for locked notes.
- After you enter the password for one locked note, you can view other locked notes without reentering the password. The notes are locked again after a period of inactivity or when you close the browser window.
- If you reset the Notes password using Notes on an iPhone, iPad, iPod touch, or Mac, entering the new Notes password only lets you view locked notes that use the new password. If some of your notes use an older password, you must enter that password to view them.
- Note: If you locked your notes with your Apple device’s passcode or login password, you can’t view them on iCloud.com.
- Close locked notes: Click
in the Notes toolbar.
To add a lock to a note, remove a lock from a note, change the password for locked notes, or reset the password if you forget it, use the Notes app on your iPhone, iPad, iPod touch, or Mac. See the Apple Support article How to lock notes on your iPhone or iPad or Lock your notes on Mac in the Notes User Guide.
