Solution 1:
you must assign the guide to the correct aesthetic and you used fill:
guides(fill=guide_legend(ncol=2))
And you should take care of the warning with geom_bar
Creating multi column legend in ggplot
Solution 1:
you must assign the guide to the correct aesthetic and you used fill:
guides(fill=guide_legend(ncol=2))
And you should take care of the warning with geom_bar