newsticker-show-descriptions-of-new-items

newsticker-show-descriptions-of-new-items is a variable defined in `newst-plainview.el'.
Its value is

t

Documentation:
Whether to automatically show descriptions of new items in *newsticker*.
If set to t old items will be folded and new items will be
unfolded. Otherwise old as well as new items will be folded.

You can customize this variable.