The Show/Hide option allows
setting which fields to show/hide from the display. For example when analyzing
upper protocol layers, message Info and MAC layers might be useless and the user
may choose not to show them for a more comfortable and compact
view.
Notes:
The Msg (Message number field) can’t be
hidden.
The message fields' legend colors match those actually shown in the
respective message fields.
If any of the elements is hidden the icon's color
will change 
Figure 145 – Showing/hiding root fields