Controlling the Overall Appearance of Graphs - R Graphics - page 282

# theme() has no effect if before adding a complete theme
p + theme(axis.title.x = element_text(colour = "red" )) + theme_bw()
# theme() works if after a compete theme
p + theme_bw() + theme(axis.title.x = element_text(colour = "red" , size = 12 ))
Many of the commonly used theme properties are shown in Table 9-3 .