Consistent width of boxplots if missing data by group?

Question

I have a similar question previously discussed for barplots, but with missing solution for boxplots: Consistent width for geom_bar in the e

Answer 1

We can make use of the preserve argument in position_dodge.

From ?position_dodge

preserve: Should dodging preserve the total width of all elements at a position, or the width of a single element?

ggplot(data.sub, aes(x=variety, y=note, fill=treatment)) + 
 geom_boxplot(position = position_dodge(preserve = "single"))