While your pricing and availability is synced automatically, If you notice any differences between the Guesty For Hosts and Booking.com calendars, you can manually push rates. In the calendar, to the left of a particular property click the Push Rates button:
Important:
The source of data is your Airbnb calendar, so when you "push rates" in Guesty For Hosts, the rates and availability are synced between your Airbnb and Booking.com calendars.
To push rates for all properties, go to Menu > Booking.com > Push Rates and Availability.