There are three options for Window Video Properties at Business System and Windows Navigation Diagram levels (i.e. Foreground, Background, Font).Although there is a Color dropdown in the Font dialog box it has no effect.
The Font dialog box has a Color dropdown which has no effect i.e. you can change it and save it but when the dialog is reopened the change was not saved.
The Color property can only be changed via the Foreground & Background dialogs.