r - Change the font size of a ggplot chart -

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in ggplot chart have title chart , values x , y axis. when save chart image labels tiny.

i tried change font size using:

size = 21

but didn't work. there easy way chage font size whole chart?

size of texts changed using function theme() , choosing element need modify. set font size texts in plots attribute text should changed.

ggplot(mtcars,aes(cyl,mpg))+geom_point()+theme(text=element_text(size=21))

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