To set specific opening hours, which will exactly control the opening hours of your staff, cancel the Opening hours in the section Business Details.
Navigate your cursor to the line with the requested opening hour and click on the small cross. A sign will appear, saying that you are always closed.
Opening hours will now be completely depended on the opening hours set for individual staff. Your clients will now see only those opening hours during the booking.
To set it, just open the Staff section in the Business tab. Then click on the requested staff.
You can tag the option Set custom booking hours. After that, an identical schedule, as the one you used when entering opening hours during the registration, will appear.
Using the same method, assign requested hours to the staff. Do it the same way you set the opening hours during the registration.