Main icon library +
Click Change to choose a calendar icon library for representing dates
Today icon + Change
Click Change to choose an icon for representing current date on the
Use diffrent icon
library for day names + Change
Enable this option if you would like to have icons
for day names different from those available in main icon library. Use Icon
library for day names option to set separate icon library for
day names. Click Change to choose a calendar icon library for day names.
Defines icon spacing for desktop calendar shown as icons.