Axis text on both sides

[saslaw]

Hi, is there any way to show the x-axis ticks, text and labels on both top and bottom of the facet? See image, I'd like to have the Fraction 0–1 on both sides. I don't want it on every plot, just at the very top and bottom. Here I'm using
facet_grid2(SampleID ~ ., , scales = "free_y", axes = "margins")

Thank you!

[teunbrand]

You can add a secondary x-axis guide that should do the trick. Wouldn't even need ggh4x::facet_grid2() for this.

library(ggplot2)

ggplot(mpg, aes(displ, hwy)) +
  geom_point() +
  facet_grid(
    drv ~ .,
    scales = "free_y"
  ) +
  guides(x.sec = guide_axis(title = "displ"))

^{Created on 2025-06-18 with reprex v2.1.1}

[saslaw]

Of course 🤦🏻 thanks so much for the quick reply!