Display All X-Axis Labels of Barplot in R (2 Examples) - Statistics Globe Example 1: Show All Barchart Axis Labels of Base R Plot. Example 1 explains how to display all barchart labels in a Base R plot. There are basically two major tricks, when we want to show all axis labels: We can change the angle of our axis labels using the las argument. We can decrease the font size of the axis labels using the cex.names argument.