You can sync the currency to Airbnb by updating your listing content from the Airbnb Manage Channel.
Go to Manage Channel → Airbnb.
Find the relevant property and click Manage.
Select Update Listing Content.
Choose Update only selected content.
Select Currency.
Confirm and proceed with the update.
Once completed, the selected currency will be pushed and updated on Airbnb for that listing.
Note:
This action only updates the currency and does not affect other listing details unless they are select