Last updated: 2017-07-20
Source: https://support.freshdesk.com/support/solutions/articles/225370-are-there-any-limitations-in-the-drill-down-option-for-the-reports-
Please find the limitations in the number of drill down options available for reports given below:
A maximum of 5 filters (fields) can be applied in each report.Each of these 5 fields can include a maximum of 50 values.A maximum of 25 tickets that were most recently modified will be shown when you click on a bar graph. The rest have to be exported.