
The font size in that application is eyestrainingly small for me to work with. How do I set it to a size of my choice?

The font size in that application is eyestrainingly small for me to work with. How do I set it to a size of my choice?
The culprit is
[super-user-command]
super-user-command=sudo
in ~/.kde4/share/config/kdesurc. When that configuration item is either removed, or the full path to the sudo binary is supplied, application styles and font settings work in YaST2, too.
qtconfig is mentioned everywhere as the solution to Yast2 font size.
Try to launch it from a real root login rather than via kdesu.