You can edit the amount of shares directly in the bet panel now
May 13, 2025
Just tap the shares/to win number

Seems like I can't use this to make bets that would cost less than 1 mana, is that intentional?
TBH since this feature is kind of 'hidden' it would be a really good fit for the site-wide update. Users might not notice it otherwise.
@Eliza yeah, I'm just not sure how many uses care. Would be nice to be able to send it out to only users who have placed a limit order, or something like that