My bipolar changed with menopause. Until about 18 months ago I was more stable than I'd ever been. I wasn't going to go off meds but I have severe bipolar. I can see that someone with a mild bipolar who got through menopause and found they weren't cycling in response to hormonal changes might be able to come off meds or at least reduce them.

On the other hand I've been in very bad shape the last 18 months so menopause was far from a cure-all.

But it might be a factor for someone occasionally.