The following settings that you specify in the brms.properties file impact all the graphs produced from Ruleflows on the local machine: 


These properties set the font type and size used by the graph visualizer
  com.corticon.crml.CrmlGraphVisualizer.fontname=Helvetica-Narrow.ttc
  com.corticon.crml.CrmlGraphVisualizer.fontname.ja=msgothic.ttc
  com.corticon.crml.CrmlGraphVisualizer.fontsize=9