Don't like the default fonts in YaST2 modules? Here's how to change them. Just use su to get root access and then use 'qtconfig' to change the fonts.
Qt Configuration with openSUSE default settings
I prefer DejaVu fonts with size 10. You can use these or any other fonts you like.
See the difference between the old and new YaST2 modules! Much more better on the eyes, I think you will agree.