no Lock option in some Notes

See if this paragraph can help you:

You can only lock notes on your device and notes in iCloud. You can't lock notes that have tags, PDFs, audio, video, Keynote, Pages, Numbers documents, or notes that use IMAP to sync with accounts, like Yahoo, Gmail, and Hotmail. You also can't password protect notes that you share with someone else. If you want to stop sharing a note, open the note, tap the Add People button, then tap Manage Shared Note > Stop Sharing.

Extracted from this support article:--> How to lock or unlock notes on your iPhone, iPad, and iPod touch - Apple Support

Regards

Giulio

ejcollier wrote:

The Notes are synced to iCloud. But there are email addresses in them. Is there a way to take off the hyperlink for the email addresses?

There’s something else going on, then.

A note with an embedded email address stored on iCloud can be locked, as shown below:

(The email address shown in the note is an RFC-reserved example domain, and does not exist.)

Probably either sharing is enabled for the note, or maybe you’re syncing to iCloud via IMAP?

Notes sync to email accounts, and not all email accounts support locking notes. So move your notes to a different folder that syncs to iCloud or that is just on your phone.

Thanks, Giulio, for your more complete answer.

Don't mention it, Lorenzo.