Enable the user to change the default font
There is currently no way to change the default font from Calibri. This can result in style inconsistencies with Visio drawings created with earlier versions that had Ariel as the default. In addition, we have found print issues with Calibri and Adobe Acrobat through a print server. This may be a rare occurrence but it's an example of why the default font should be defined by the user.
Andrew B commented
This should be an option you can set along with the style. I really with Visio could just adopt the style system from the rest of the Office suite: it's frustrating that it looks so similar, yet underneath Visio behaves so differently.
In previous versions you can set default font in default template.
but since Visio 2010 for change default font, you must change it in Windows Register