How to remove the comma in facet labels when ".multi_line = FALSE"

Question

ggplot(mpg, aes(displ, hwy)) +
      geom_point() +
      facet_wrap(c("cyl", "drv"), labeller = labeller(.multi_line = FALSE))

I would like to replace the comma with space in labels.

Answer 1

mpg$label <- paste(mpg$cyl, mpg$drv)

ggplot(mpg, aes(displ, hwy)) +
      geom_point() +
      facet_wrap(~label)