gnus-auto-select-on-ephemeral-exit

gnus-auto-select-on-ephemeral-exit is a variable defined in `gnus-sum.el'.
Its value is

next-noselect

Documentation:
What article should be selected after exiting an ephemeral group.
Valid values include:

`next'
Select the next article.
`next-unread'
Select the next unread article.
`next-noselect'
Move the cursor to the next article. This is the default.
`next-unread-noselect'
Move the cursor to the next unread article.

If it has any other value or there is no next (unread) article, the
article selected before entering to the ephemeral group will appear.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 23.1 of Emacs.