It's embarrasing. I've made a mistake and traded the opposite. Paid 5066,96€ for a ESTX50 3750-4250 Box ending the 19NOV21. That's why I'm asking if IBKR will bring me back 5000€ automatically or is mandatory to exercise ITM options on the last trading day. 66,96€ is a small loss, but 5000€...