Determining which protocol levels are seen:

The amount of information seen in the summary window
for a single frame can be controlled.  In general,
each frame has several nested levels of protocols which
may generate summary lines.

Checking "highest level only" for the summary view
causes only the one line of information for the highest
(most deeply nested) protocol to be shown.  If it is
not checked, one line for each protocol will be shown.

(See also "Setting up the display filters".)
