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Using the guides argument in plot_layout() you can collect and collapse guides from plots. By default these guides will be put on the side like with regular plots, but by adding a guide_area() to the plot you can tell patchwork to place the guides in that area instead. If guides are not collected or no guides exists to collect it behaves as a standard plot_spacer() instead.




p1 <- ggplot(mtcars) + geom_point(aes(mpg, disp, colour = factor(gear)))
p2 <- ggplot(mtcars) + geom_boxplot(aes(gear, disp, group = gear))
p3 <- ggplot(mtcars) + geom_bar(aes(gear)) + facet_wrap(~cyl)

# Guides are by default kept beeside their plot
p1 + p2 + p3

# They can be collected and placed on the side (according to the patchwork
# theme)
p1 + p2 + p3 + plot_layout(guides = 'collect', ncol = 2)

# Using guide_area() you can also designate an empty area for this
p1 + p2 + p3 + guide_area() + plot_layout(guides = 'collect')