Apple Mail POP settings?

If you mean the Apple app "Mail" it supports POP3, IMAP, SMTP, Exchange and S/MIME.

If you mean Apple iCloud mail, that is IMAP with email client apps such as Mail; and Webmail for access via browsers.

Even if you could trick the Mail app to use POP with iCloud Mail, I suggest that is a risky endeavor ... Apple has never promoted or documented POP support in iCloud mail. If POP service is running on iCloud Mail it's only because mail servers typically support multiple protocols; however in most implementations only one or two are usually implemented. In the case of iCloud mail that would be IMAP and Webmail; POP, if it's running, may not be fully functional on iCloud Mail. Here are Apple's specifications for iCloud mail -> Mail server settings for iCloud email clients - Apple Support

Also, remember that under POP, when you download email messages they are normally deleted from the server and remain only on your local computer.

Not correct. By default Apple mail does the IMAP. If you want POP you need to trick the system. To set up the account pick "other' then on next screen put in a bogus email and PW. On the next screen then put in your real credentials and pick POP.

I should’ve been more clear.

The Apple Mail APP supports POP for email accounts, all except for iCloud Mail accounts. iCloud does not support POP, but you can use POP for other email accounts, like Google, Microsoft, etc.

iCloud Mail does not support POP.

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