The previous section told you how to tell Gnus which topics to display. This section explains how to tell Gnus what to display about each topic.
The topic
lines themselves are created according to the
gnus-topic-line-format variable (see Formatting
Variables). Valid elements are:
Each
sub-topic (and the groups in the sub-topics) will be indented
with gnus-topic-indent-level times the topic level
number of spaces. The default is 2.
gnus-topic-mode-hook
is called in topic minor mode buffers.
The
gnus-topic-display-empty-topics says whether to
display even topics that have no unread articles in them. The
default is t.