Go to the "Products" tab and then select the bookable product you would like to require a confirmation. Click the edit button:
Once you have selected this kindly select the tick box "Requires confirmation" and click "Save":
You can repeat this procedure for as many bookable products as you like.
Once you go to the "Appointments" page and book a patient in for that particular appointment the below will appear, the appointment will only be outlined with the colour selected in the "Products" settings as this booking has not been confirmed yet:
Once you tick the box and therefore confirm the appointment then the appointment box will fill with the appropriate colour and will not only be outlined as previously: