Step by step instructions -
1. Go to Service Pages > Booking Pages > Select a specific booking page
2. On the Booking Page, navigate to the left menu and click on settings
3. Click on "Availabilities"
4. In the Calendar settings, you would find "Allow bookings to extend past operating hours". Click "Yes" if you would like to allow customers to book a service beyond the end of operating hours. To restrict, click "No".