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Change Font Size of ggplot2 Plot in R | Axis Text, Main Title & Legend With the following R syntax, we can change the size of the axis titles of our plot. We can adjust the size of all axis titles… my_ggp + theme ( axis.title = element_text ( size = 20)) # Axis titles Figure 6: Changing Font Size of Axis Titles. …only the x-axis title… my_ggp + theme ( axis.title.x = element_text ( size = 20)) # x-axis title Change a To make the x-axis text label easy to read, let us rotate the labels by 90 degrees. We can rotate axis text labels using theme() function in ggplot2. To rotate x-axis text labels, we use " axis.text.x" as argument to theme() function. By default, R will use the variables provided in the Data Frame as the labels of the axis. We can modify them ... Chapter 4 Labels | Data Visualization with ggplot2 - Rsquared Academy Y axis label ggplot(mtcars) + geom_point(aes(disp, mpg)) + labs(title = 'Displacement vs Mileage', subtitle = 'disp vs mpg...