[VM] label synchronization between vm, imap server (gmail) & other clients

[E]

Hi all, I noticed that a message that is "flagged" in apple Mail.app
also appeared "starred" in gmail, and can be un-flagged on gmail by
un-starring it there, and vice versa.  These flagged or starred
messages appear in vm as red-highlighted summary lines with an
exclamation mark to the left of the subject line, which is great.  But
I don't see any way of un-marking/ un-labeling them to remove the
exclamation mark.  When the message is un-flagged/ un-starred on
Mail.app or gmail.com, this change does not propagate to vm.  any
suggestions?  thanks, best, E