To see more details about your segment, navigate to the 'My Segments' page
Find the relevant segment by filtering through the search options
Click on the 'Name' of the segment. You will be redirected to the its page.
Here you can see:
An overview of the segment
The performance of the segment (Information available for the following DSPs: Adform, Splicky, The Trade Desk, LiquidM, DBM, Hawk, Appnexus, FUSIO By S4M)
The history of an segment
The modelling of an segment