group parameter not expire, and tickmark !

[Gijs Hillenius]

I'm using Gnus' imap for mail.


The Emacs Gnus wiki tells me

"Ticked messages are always shown when you enter a group". And this is
true, unless if this (below) is a group parameter :

((display .
          [not expire]))


Because then messages marked with ! will show up in a list of "200" -
the default if there are more than 200 - other messages in that group.

I was hoping that, per the manual, "3.8 Limiting"

Doing

/ m u 

or perhaps

/ m !

would limit this "200" to the messages marked ! But no.

What am I doing wrong (now)?