Click the legend to select it. Now all of its attributes can be controlled from the bottom three icons on the toolbox. The first icon controls the foreground and background color, the one in the middle controls the fill and pen patterns, and the last one controls the line style and thickness.
KaleidaGraph is a thoughtfully designed graphing and data analysis application for research scientists, as well as for those in business and engineering fields. It produces publication-quality graphs, and easily converts the most complex data into a functional display.