On the stereonet view, the scale of the Legend can be adjusted using the Legend Scale option (sidebar > Display Settings > Stereonet Options > Legend Scale).
On chart views, the font size is available in the sidebar.
If you add text to a view (Tools > Add Text) you can customize the text after it has been added, by clicking on the text box to select it, and then the properties of the text box will be available in the sidebar. This also applies to all other tools (i.e. click on the tool and the properties can be customized in the sidebar).
For customizing printouts, this article describes advanced printing features for Slide (also available in Dips).