The FontScale setting (changed from GUIScale which still works if used) determines the ratio of the font size, button size, and field height used on the screen. A larger number (like 1.0 (which=100%) or (1.2 (which=120%)) displays a larger font but fields may partially overlap vertically. A smaller number (like 0.8 (which=80%)) displays a smaller font resulting in more vertical space between fields.
Usage:
FontScale accepts numeric (including decimal) values which should be close to 1.0.
Example: FontScale=.95
Default:
.85
See:
MenuFontName
MenuFontSize
MenuFontAutoSize