In Appointments+ Unable to Clear Incorrect Working Hours

When I installed A+ I inadvertently left Thursday as a day when there were service hours available. I have tried to set service hours to "NO" but they are still visible and able to be scheduled in the front end.

I have tried changing the time in an effort to have the NO reset, as well as toggling back and forth between YES and NO. I have even deactivated and reactivated to no avail.

I cannot publish the appointment calendar and make it public in the site until this issue is resolved. Any assistance you can provide would be appreciated.