There are no indicators for length of time retention when using DS ControlPoint.
Pelco Video Management
DS Control Point all versions
DS Control Point does not support retention history indicators.
To verify your storage retention you must manlly search playback for as far back as you have indicated on the time line.
Click on Search, select a camera. Zoom all the way out on the timeline.
Drop down the calendar and select random passed days . You will see the length of retained video on the time line.