I am working on a Visio project where the client wants to be able to configure the font used in each document. These documents have many custom masters, but the user can add there own annotations too. Therefore, I needed to find a way to synchronise the fonts used in both cases. Visio has Themes and Variants, and some of these built-in settings use different fonts, but there is no way of editing the fonts used in each theme since Office 2010 ( see Create a custom theme). There have been many questions on the web about changing the default font used in Visio, which is currently Calibri, but there were no easy answers found. Visio used to use Styles rather than Themes, and these capabilities are still there, but the buttons are not displayed in the default ribbon. However, the Drawing Explorer window does show the Styles and their hierarchies.
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