We agree that managing recurring bills could be better. Currently, the way to edit recurring bills is to change the most recent copy and that will change ones that follow. It will not affect the past expenses.
We’re considering how to improve this, and will leave this under review for now.Kolton Gagnon commented
I agree with Mark van de Korput that this is currently very difficult to change since you have to go through the activities and find that recurring amount. For a power user, which has over 100 items a month, it's time consuming to find the recurring entry and update it.