Hi,

Is it possible to change the size (length) of the lines in chart legends? They are very small and hard to read.

Yes. Look at the "Default Legend" object or options on a new legend object.

Please correct me if im wrong but doesn't the legend object only apply to contour plots? Please look at the attached image: I try to change the size of the small lines near the Labels "Line A", "Line B", "Line C"

Sorry, I misunderstood your question.