To change the default font in CorelDRAW X6, click the Text tool and without clicking anywhere in the document window, choose a font from the Font list on the property bar. In the Change Document Defaults dialog box, you can set this font as the default font for artistic, paragraph, dimension, and/or callout text by enabling the corresponding check boxes.
Tip rovided by Ludmila Minkova, CorelDRAW Team.
By the way, I have a similar question.
How do I Change the Default Font in CorelDraw PERMANENTLY (forever), and not every time?
Thank you.