I'm trying to create a plot with yellow points, but the graph has red points.
library("ggplot2")
data(penguins, package = "palmerpenguins")
ggplot(penguins, aes(bill_length_mm, bill_depth_mm)) +
geom_point(aes(colour = "yellow"))
#> Warning: Removed 2 rows containing missing values (geom_point).

Created on 2021-06-25 by the reprex package (v2.0.0)