Window > Preferences > Process Developer > Colors and Fonts
to view these preferences.
The Expression Builder for creating data manipulation expressions is available for several activities, transition conditions, and queries. You can set the font properties for the Process Developer Expression Text within the Expression Builder.
The BPEL Unit Testing (B-unit) view contains a toolbar button that opens a B-unit XML Compare window. You can set a preference for the text color and font that appear in this window.