Summary Buffer Mode Line
You can also change the format of the summary mode bar (see Mode Line Formatting). Set gnus-summary-mode-line-format to whatever you like. The default is ‘Gnus: %%b [%A] %Z’.
Here are the elements you can play with:
‘G’
Group name.
‘p’
Unprefixed group name.
‘A’
Current article number.
‘z’
Current article score.
‘V’
Gnus version.
‘U’
Number of unread articles in this group.
‘e’
Number of unread articles in this group that aren’t displayed in the summary buffer.
‘Z’
A string with the number of unread and unselected articles represented either as ‘<%U(+%e) more>’ if there are both unread and unselected articles, and just as ‘<%U more>’ if there are just unread articles and no unselected ones.
‘g’
Shortish group name. For instance, ‘rec.arts.anime’ will be shortened to ‘r.a.anime’.
‘S’
Subject of the current article.
‘u’
User-defined spec (see User-Defined Specs).
‘s’
Name of the current score file (see Scoring).
‘d’
Number of dormant articles (see Unread Articles).
‘t’
Number of ticked articles (see Unread Articles).
‘r’
Number of articles that have been marked as read in this session.
‘E’
Number of articles expunged by the score files.