1. First, make sure you have set your work schedule.
Menu > Employees > Choose the employee > Working Days Schedule.
2. Settings > Background Intensity without schedule. Drag the slider all the way to the right.
3. Return to the menu where you set appointments. The time period without appointments will appear shaded, dark gray.
The application allows you to set appointments even outside of the schedule – in the shaded area – but this way, you are notified.