This section of the System Configuration tool allows you to modify the appearance of calendars, in the Calendar tool as well as various places in the platform where a calendar is presented for selecting a date.
This option affects the appearance of date pickers used across the platform, such as when selecting a date for event sessions. There are a large number of preset options to choose from, with a preview to the left of the option showing how it looks.
This option affects the different items that can appear in the Calendar tool, as well as the Calendar widget. For the six different item types that can appear on the Calendar, their colour can be individually adjusted.
For more Information on Calendar Settings please take a look at the following video