Flag order in Catalina

mmahre wrote:

How do I re-arrange the sort order of flag colors in the left mailbox panel? Seems like drag and drop should be the answer, like other mailboxes, but it doesn't work.

left mailbox panel?

Maybe a screen shot would help clarify what you are wanting to do.

Flag emails in Mail on Mac - Apple Support

Finder sidebar you can drag and drop.

Customize the Finder toolbar and sidebar on Mac - Apple ...

I can rearrange color order in Finder but not in mail — like mmahre. I've been using these flags for 10+ years and the order matters, I really don't want to start mixing them up now.

Picture: left is Finder, right is Mail. Drop & drag does not work for mail. Please advise. Thanks!

Tell Apple what new features added you'd link in Mail via Feedback - macOS - Apple 

As leroydouglas pointed out:

Thank you, I have this, I can change in Finder. But it doesn't carry on to Mail, still no change there.