Able to schedule appointments in the past

Hi guys,

I sent a support request 8+ hrs ago and had no confirmation / follow-up so am sending a second request (apologies if you have the first one too).

With Appointments+, how do you stop people scheduling appointments in the past? If the current system time is say 9am .. appointments from 8am are still shown as bookable. Am I missing a setting somewhere?

Thanks & regards,
Andrew