To change the font of a calendar:

1. Open the Adjust tab (Command-Shift-I) and select the calendar object in question.

2. Locate the Calendar panel under the Adjust tab and pick a font from the Font popup menu:

   

   Change calendar font.

To change the font sizes used by a calendar:

1. Open the Adjust tab (Command-Shift-I), select the calendar object in question and locate the Calendar panel.

2. You can set the Size attribute individually for the Year, Month and Day component of a calendar.

   Please note, that a size value of 0 means, that the calendar will automatically calculate the font size proportionally to the size of the whole calendar object.

   Choose the appropriate Size field on the Calendar panel:

   

   Change calendar font size.