Show Empty Items
Selecting Show empty items will display all dates on the calendar, whether they have a booking or not.
Unchecking this option will only populate the calendar with items that have bookings for the time period selected.
Group Items in Bookings
Selecting Group items in bookings will group the items from a given booking on the calendar.
If the items have similar start times, then they will be grouped together. This helps reduce the number of bookings displayed on the Customer Calendar.