Zhiwei Chen <condy0919@gmail.com> writes:

> It can be reproduced in emacs -Q using the following snippet.
>
> #+begin_src elisp
> (setq newsticker-retrieval-method 'extern)
> (setq newsticker-url-list-defaults nil)
> (setq newsticker-url-list '(("Planet Emacslife" "https://planet.emacslife.com/atom.xml")
>                             ("LWN (Linux Weekly News)" "https://lwn.net/headlines/rss")))
>
> (newsticker-show-news)
> #+end_src
>
> Then press G to fetch all feeds in LWN and Emacs planet, but nothing is
> displayed in the right window.

I don't use Newsticker, so I don't know what it usually looks like, but
following your recipe I get the following display: