Only active deliveries will be shown in your calendar with colours.
To cancel a delivery:
Select the delivery which you would like to cancel (please note, only yellow coloured deliveries can be cancelled):
You will be directed to see the details of this delivery. Just hit 'skip delivery':
As a reassurance, you will be asked if you are sure that you would like to skip this delivery, you just need to say yes:
Once you done this, you will be redirected to your calendar where you will see that the upcoming delivery has disappeared from your calendar:
Remember our deadlines for changes.