If they still can't win this game with that much of an advantage, I don't know what else to say.
Of course they will. It's not just about Nottingham Forest recently sacking their manager, but also about other aspects like the squad strength comparison & Arsenal who will be playing at home.
BTW, the odds format you're displaying is confusing me & probably other readers. It would be a good idea to set your odds format, Europe format is good.