Setting up Font Style and Font Size of Title Text

How to set the font style and font size of the title text?

Titles display in the viewer window are activated in
File > Preferences > Appearance
and setting the flag at "Titles"

The font type and size can be modified with the following commands in the TUI.
For the font choice:
(cxsetvar 'frame/title/font "name=Segoe UI") (could be roman, calibri, etc)
For the font size (0.2 is the default):
(cxsetvar 'frame/title/font (format #f "size=0.4wru"))