I've reviewed the patchwork documentation, but I'm still not sure of how to move my plot between positions, like so:
library(patchwork)
library(ggplot2)
p <- ggplot(mtcars, aes(x=mpg, y=cyl)) + geom_point()
p + p + p + p +
plot_spacer() + p + p + p + plot_layout(nrow=2)
But instead I want :