19.7 About themes

You can change the default global theme (background color, grid lines etc. all non-data display):

# go back to a previous plot
p <- ggplot(data=df_long, mapping=aes(x=value)) + geom_histogram()

# Try different themes
p + theme_bw()

p + theme_minimal()

p + theme_void()

p + theme_grey()

p + theme_dark()

p + theme_light()