This is peculiar. It seems to work only when the legend is made up of expressions (for the pie chart, the legend represents the dimension).
As an alternative since I am assuming your dimensions are limited to only a couple, put the values on the pie chart itself by using Values on Data Points with another expression of Status. This way Active/Inactive show next to the appropriate "slice". I also showed as an example, a bar chart where the legend consists of just expressions. In this case, the way to make the legend horizontally works as described by the others here.
If you are insistent on the horizontal legend, take a screen shot of a horizontal legend and then use this as a textbox below your chart.
Please find attached.
Hope this helps!
