Time Slots I created slots with the wrong duration. Slot duration  cannot be edited . Delete the incorrect slots and recreate them with the correct duration. If customers have already booked appointments on those slots:  When you delete the slots, you'll be prompted to either cancel the appointments (optionally with a rebooking email) or move them to a holding area on the  Appointments List  page for manual handling. I created slots on the wrong date. Use  Slots → Move Slots  on the Appointments page to move all slots (and any appointments) to the correct date. You can optionally notify affected participants by email. My slots are 20 minutes, but I need a 30-minute break mid-schedule. If the break doesn't align with your slot duration, create slots in two batches — before the break, then after. Why are some slots yellow? Yellow indicates the time has already  passed  — these slots are hidden from participants. Check the date and either delete or move them. Correctly dated slots appear  blue and remain bookable.