Geom_Segment: Size function not changing line thickness on plot

[Wardah Mustahsan]

Hi

I am having issues with the "size" function of geom_segment when designing my violin plots. I think the default lines are too thin. I tried three values as a test run:

size = 1.0

size = 0.3

size = 0.7

Then line remains the same thickness no matter what. I am not sure how I am using the code incorrectly.  I tried looking here for some guidance

https://mpn.metworx.com/packages/ggplot2/3.3.0/reference/geom_segment.html

but  it did not really help.

Here is some of my code:

YLD1<- {YLD + theme(text = element_text(size = 14)) + + ylab("Yield (kg/ha)")+ + geom_segment(aes(x = 1 , y = 1921.66, xend = 1.3, yend= 1921.66,colour = "Overley", size =0.01))  + geom_segment(aes(x = 1 , y = 1921.66, xend = 0.7, yend= 1921.66, colour = "Overley", size =0.01)) ....

So in this plot no matter how I changed the size the thickness was always the same.

Can you someone give some guidance?

Thanks

Rose