1. From your Bookings page, click on the three white lines in the top left corner of your screen
a. Click on Settings
2. This will bring you to your Schedule
a. Click on the day you are wanting to close
b. You will see the Open toggle in the top right corner, simply toggle it off, ensuring you click Save at the bottom once you have done this
Your Schedule is now closed on that day.
Note: The services within that day will remain within that service if you ever did decide to open it back up again in the future.