Top X dashlet is an element for paid edition. According to your profile you’re doing it ‘raw’.
In the past I made a post to do it in raw on 2.1 for top cpu utilization:
Context / Search Filters: the actual thing you want list for.
Instead of Service: CPU Utilization in linked post do something like Interf* to get all the interfaces.
Sorting column: interfaces have multiple performance data values, so it is either the sent or received bits that get sorted first.
Probably you want something like:
Services: Service performance data - value number 2 ; Descending
Services: Service performance data - value number 3 ; Descending
Or you make separate views for sent and received.
Edit:
Oh, and the other post was about get Host alias mentioned in Top X dashlet, so you can change that to Host name instead. (-;