I would like to build up the board in the way that 'Done' (For done of user stories within Team) and 'Done-Done' (After final acceptance by the users) to be used. What I found is unfortunately ony the right column in configuration can have status of Done. (Green bar.)
Accordingly Burn Down chart takes the status change for Done-Done.
Those who encountered this issue as well:
how did you solve this on your project? (I would like to keep having these two columns.)