Follow these steps to accomplish the task:
In Zenoti, ensure that you are in Organization view.
On the main menu, click Employee.
On the left pane, expand Settings, and then click Block Out Time Types.
The Manage Block Out Time Types page with the list of configured block-out times appears.
For the required block-out time, click the Edit icon as shown in the following image.
The Edit Block Out Time Types page for the selected block-out time appears.
Under the Duration field, select the Bookable check box to allow guests to book service appointments over a block-out time. Refer to the following image for more information.
Alternatively, you can clear the Bookable check box to prevent guests from booking service appointments over a block-out time.