Scotty, I have a question. Scotty - A while back, you showed me how to create a group in contacts and "mark as company" the whole group for the purpose of Christmas cards, i.e. the address reads The Smith Family versus Mary Smith. I can't remember how to "mark" the whole group versus going one contact at a time. When I "select all", the "mark as company" and "mark as person" options are disabled. Please advise. Thx so much.
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This was a feature that was included in Apple's MacOS address book for many years then they removed it for about 4 years. The good news is it is back but you need to be on macOS Catalina 10.15 in order to see that functionality. If you've not yet updated or don't want to at the moment, I can assist if needed.

Depending on the age of your computer, you can go to the App Store on your Mac and then search for “Catalina”. It is 10.15. After the update, you’ll again be able to flip all contacts from person to company all at once.

Note: always make sure you’ve backed up your computer before ever doing an update.