R: How to control font size of legend map in plotly/ggplotly?

Question

How can I control the font size of the legend map in plotly/ggplotly?

Answer 1

You can change the font size of the legend using legend.text in your theme like this:

library(dplyr)
library(ggplot2)
library(plotly)
p <- iris %>%
  ggplot(aes(x = Sepal.Length, y = Sepal.Width, color = Species)) +
  geom_point() +
  theme(legend.text=element_text(size=3))

ggplotly(p)

p <- iris %>%
  ggplot(aes(x = Sepal.Length, y = Sepal.Width, color = Species)) +
  geom_point() +
  theme(legend.text=element_text(size=15))

ggplotly(p)

^{Created on 2022-07-15 by the reprex package (v2.0.1)}