In YITH > Booking and Appointment > Configuration > Availability rules, you can create global rules to apply to all your bookable products. These options are the same ones you can find on each product’s edit page but, from the Availability rules subtab, they will be applied by default to all products. For example, you can use the global availability rules to set all products as “Not bookable” on specific days (e.g. Sundays), during the Christmas holidays, or during the summer:
