gnus-treat-hide-citation-maybe

gnus-treat-hide-citation-maybe is a variable defined in `gnus-art.el'.
Its value is

nil

Documentation:
Hide cited text according to certain conditions.
Valid values are nil, t, `head', `first', `last', an integer or a
predicate. See Info node `(gnus)Customizing Articles'.

See `gnus-cite-hide-percentage' and `gnus-cite-hide-absolute' for
how to control what it hides.

You can customize this variable.