>>>By mistake, I clicked on the "Mark" button below a message I was reading, instead of the "Reply" button. Now I'm getting messages appear in my Agent, which I don't want.
>>>
>>>Is there any way to "unMark" a message/thread after having "Marked" it? I didn't see anything in the Help about that. Am I missing something obvious?
>>
>>You can click on Mark button again. Hover mouse over it to see what its action is.
>
>Ah, OK, so Michel has already implemented this as a toggle. Right now I see no indication on a message that it's marked, so if Michel could at least change the button label to "Unmark" that would be better, I think.

There is a tooltip. The Filter works the same way, I just noticed.

BTW, I don't think I either used filter button on a thread.