Ok, I figured out a way to remove VIP status on my iMac 2019 running Sequoia 15.1 -
1.) Open the Mail app
2.) On the left side screen, open the VIPs list (drop down menu)
3.) Start a new email
4.) type the name you want removed in the Address bar and hit enter
5.) Move cursor to highlight their name and tap small arrow to drop down menu to right of recipient's name
6.) Tap Remove from VIPs
I had about 10 addresses in my VIPs that I no longer wanted there. I entered ALL of them in my address bar, then went backward from the last name, one by one, removing from VIP then deleting their name from the address bar.
Whew. Should not be this difficult. And there is NO "Help" info on this. Unacceptable, Apple.
Hope this helps the next person.
KC