Unable to Control Bar Thickness in geom_bar() with size Parameter

[BertramLoong]

I'm trying to modify the appearance of bars in ggplot2 and increase their thickness in a bar plot created with geom_bar(). I’ve tried adjusting the size parameter, but it doesn’t seem to affect the thickness of the bars. Is there another way to control the thickness of the bars more easily? My ggplot2 version is '4.0.0'. Here's a minimal reproducible example:

data <- data.frame(
  Group = sample(c("a", "b"), 50, replace = TRUE),
  value = rnorm(50, mean = 5, sd = 1)
)

ggplot(data, aes(x = Group, y = value, fill = Group, color = Group)) +
  geom_bar(stat = "summary", fun = "mean", 
           position = position_dodge(width = 0.5), size = 2,
           width = 0.4) +
  scale_color_manual(values = c("a" = "black", "b" = "black")) + 
  theme_minimal() +
  theme(legend.position = "none")

[smouksassi]

use linewidth

[BertramLoong]

Thank you so much for your help!

[teunbrand]

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