[Solved] How could I get a graph have a shade (confidence interval), legend have no a shade [closed]

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First I loaded ggplot and added mtcars library to explain.

library(ggplot2)
cars <- mtcars

This is a normal ggplot graph with geom_smooth and the confidence interval.

ggplot(cars, aes(x = mpg, y= disp)) + geom_point() + geom_smooth()

plot with geom_smooth

within geom_smooth is an option se which is your confidence interval. se is default set to TRUE by setting se to FALSE it removes the confidence interval.

ggplot(cars, aes(x = mpg, y= disp)) + geom_point() + geom_smooth(se = FALSE)

geom_smooth no ci

for other geom_smooth options see 

?geom_smooth

I Hope this helps!

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solved How could I get a graph have a shade (confidence interval), legend have no a shade [closed]