Why is the text on the right most label cut off my plot?

This happens because the right margin of your plot is cutting off some of the text of the right-most x-axis. If this happens, you have to increase the space between the right margin and the x-axis. To do this, right-click on the plot and select Format. From the Format screen, click on the Background category. Increase the percentage of the right margin. This will give you more space between the margin and the x-axis text.