**strip.switch.pad.wrap** doesn't work when **strip.placement = "outside"** and **strip.position = "bottom"**: ``` library(ggplot2) base <- ggplot(mtcars, aes(mpg, drat)) + geom_point() base + facet_wrap(~cyl) + theme(strip.placement = "outside", strip.switch.pad.wrap = unit(0.1,"npc")) ```  strip will only be added on one panel when **strip.position = "bottom/left"**: ``` base + facet_wrap(~cyl,strip.position = "bottom", ncol = 2) + theme(strip.placement = "outside", strip.switch.pad.wrap = unit(0.1,"npc")) ```  ``` base + facet_wrap(~cyl,strip.position = "left") + theme(strip.placement = "outside", strip.switch.pad.wrap = unit(0.1,"npc")) ```  It doesn't work when **strip.position = "right"**: ``` base + facet_wrap(~cyl,strip.position = "right") + theme(strip.placement = "outside", strip.switch.pad.wrap = unit(0.1,"npc")) ``` 