Remove the legend alltogether:
ggplot(data=iris,
mapping=aes(x=Sepal.Length,
y=Petal.Length, color=Species))+
ggtitle("Iris")+
geom_point()+
gg_("remove legend")
Change legend font size:
ggplot(data=iris,
mapping=aes(x=Sepal.Length,
y=Petal.Length, color=Species))+
ggtitle("Iris")+
geom_point()+
gg_("set font size of legend title to 40")
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