The Filter option at the top of the screen controls the Class Type and SID of the captured packets displayed.
If no Class Type is selected, a list of the class types for which packets have been captured will be displayed. Select a Class Type, either by clicking on its entry in the list, or by setting the Class Type in the Filter bar. A list of rules for which packets have been captured will be displayed. Select a rule to display the packets captured for that rule.
In the packet capture view, an additional two options appear in the Filter bar, File allowing specific packet capture files to be selected and Detail controlling the detail level used when displaying captured packets. Finally, a Download link is provided that allows the packet capture file to be downloaded for analysis by another packet analyzer (the file is in the popular PCAP format supported by many packet analyzers).