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ggplot2 legend : Easy steps to change the position and the appearance of a graph legend in R software. Tools. Data; Example of plot; Change the legend By default, ggplot2 will automatically build a legend on your chart as soon as a shape feature is mapped to a variable in aes() part of the ggplot() call. So ifYou want to modify the legend of a graph made with ggplot2. each factor level, but it is also possible to manually specify the colors for each level. ggplot really only likes to draw legends for things that have aesthetic mappings. If you set "code names" for colors, you can define them in a manual scale Three options (where p is the plot object) # Remove the legend title: p + theme(legend. title = element_blank()) # Hide the entire legend to create a ggplot