To further adjust the Frequency Analysis chart, use the General and Advanced settings options available at the top right-hand corner
Chart type
You can choose either 'Individual Top' or 'Reference Top'.
'Individual Top' allows you to display the statements sorted separately within each category.
'Reference Top' allows for an easy comparison of statement values between categories by forcing a fixed order of statements with the first category displayed on the chart treated as a reference.
This switch activates the reference item line that is visible on all of the separate charts. Under the chart there is a legend where you can change the reference item to a different one.