How to remove duplicates in report definition in pega

Remove duplicates in Report definition

Need to check the box (Remove duplicate rows) from Query tab of report definition rule.

Default max rows in the report definition

For example, a report definition contains 500 max records; how to display Top 10 records 

from that report and what are the necessary steps, we need to follow?

We need to do some changes in the Top/Bottom rank section in the Query tab of the report definition rule. Display Top Ranked10rowsoverallbased property.