On my pc i have a 17in monitor.I find the fonts very small, i am a novice with suse. I only put it on pc an hour ago and cannot find a way of changing font size without compromising resolution. I am squinting.
What version of openSUSE are you using and what is your desktop environment (KDE or Gnome)?
Gnome:
Go to Appearance Preferences -> Fonts -> Details -> Increase “Dots Per Inch” (dpi) value
KDE3:
Go to kcontrol -> Appearance & Themes -> Fonts -> Force Fonts DPI -> Select a higher value
KDE4:
Configure Desktop -> Appearance -> Fonts -> Force Fonts DPI -> Select a higher value