Within the Diary, you can block out times to not allow online patient bookings. 

1. Go to Diary -> right click in the time slot that you want to start the block -> Fill in the details of your block -> Save Block 

see images below

If you have multiple locations, you will need to ensure you create a block for either one location or ALL locations if you are unavailable at all locations at this time. 

If creating recurring blocks you must use the recurring feature, do not adjust the end date to cover multiple days, this will not block the diary as expected. Please see the screenshot below for how to set a Holiday block from 10am to 6pm every day from the 3/1/23 to the 13/1/23.