This can work.
Elena, just curious, what did you find 'incorrect' about my answer? There's no way to dynamically change the axis label formatting, and that is in fact the correct answer to your question, isn't it?
What you are dealing with here is crazy user logics.
Your answer is CORRECT but - as Tableau does not have what I want I call it useful rather than correct. (joking...)
Don't be cross - I'll be careful where I click next time.
I really appreciate your time and your help.
You guys have a great community!
Oh Elena I'm not at all cross, and the points don't matter (I have more than enough of those). The real reason I mention it is because now that we can filter forum posts on unanswered questions a lot of us use this to find questions to answer. So if a question remains unmarked as correct, then it stays in the queue and other answerers waste their time reading your question only to find it has been answered.
Personally I wish there was a way answerers could mark questions as having been correctly answered, or 'assumed answered' which seems to be an admin thing.
Anyway, no worries Elena, I'm happy to help. (This was just a way I could work in this mini-rant that's been building up for awhile now )