Left align ggplot caption

Question

I'm using the R package ggtext to "plot align" (max left align) my title and subtitle. I also want to use these ggtext methods to "plot align" my caption.

library(tidyverse)
library(ggtext)
ggplot(mpg, aes(cty, hwy)) + 
  geom_point() +
  theme(plot.title.position = "plot",
        plot.caption.position = "plot",
        plot.title = element_markdown(),
        plot.subtitle = element_markdown(),
        plot.caption = element_markdown()) +
  labs(title = "This is the title.", 
       subtitle = "This is the subtitile.", 
       caption = "This is the caption.")

You'll probably notice the caption is right aligned, whereas the title and subtitle are "plot aligned".

How do I "plot align" my caption?

Answer 1

For the benefit of others, you can left align the caption in ggplot2 in the following way:

library(ggplot2)

ggplot(mpg, aes(cty, hwy)) + 
  geom_point() +
  theme(plot.caption = element_text(hjust = 0)) + # set the left align here
  labs(title = "This is the title.", 
       subtitle = "This is the subtitile.", 
       caption = "This is the caption.")