I used script below to draw a PCA. In order to increase the points, I added size=0 in geom_point(). But in the figure, there is a legend size. How can I remove the legend? Thanks.
ggplot(degree121, aes(PC1, PC2, col=Classification, fill=Classification, group=Classification))+ stat_ellipse(geom="polygon", alpha=0.1) + geom_point(aes(shape=Classification, color=Classification, size=0))+ theme_bw()+ scale_color_manual(values = c("red","green","blue"))