Listings from Booking.com do not adapt the same booking restrictions from a Parent Listing, which means that these restrictions should be added separately from the Booking.com listing itself.
You can do this by going to:
1. Channels
2. Booking.com
3. Room Types
4. Select Edit on the selected listing
5. Go to Rates
6. Select Update
7. In Booking Restrictions --> Min. period in advance, you can select a duration on how long before guests can book the property.
8. Hit Save Changes
Contact Hostify Support if you need any more help.