To change the font of a calendar:

1. Open the Inspector (Command-Shift-I) and select the calendar object in your document (see Using the Inspector).

2. Pick a font from the Font popup menu on the Calendar panel:

   

   Change calendar font.

To change the font sizes used by a calendar:

1. Open the Inspector (Command-Shift-I) and select the calendar object in your document (see Using the Inspector).

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.