@Anita884
Please note there is also a community for German language:
https://community.withairbnb.com/t5/Community-Center-DE/ct-p/community-center-de
Answer:
The Covid-19 extenuating circumstances policy only applies when booking is made before 15 March, to opt for a full refund. Otherwise the attached cancellation policy applies. Upon cancellation it will show the refund (if any) , before you confirm it.
Another possibility can be to modify ("change" option) the reservation , but host must accept the shift to new dates