If you'd like to modify particular date online booking settings, please refer to the following steps and modify on iPad :
Click Book and choose the date that you want to modify on the calendar
Click Booking Mgt. on the top of right side
On the left is table numbers, and on the top is time slots. Activate or inactive tables you'd like to accept online booking and the time which guests can book on that day. (For both tables and time slots : orange color means open and white color means close)
Click Done to save, then your changes will only affect on the day that you choose