bug#49003: completion-list: vertical vs. horizontal

[積丹尼 Dan Jacobson]

>>>>> "LI" == Lars Ingebrigtsen <larsi@gnus.org> writes:

LI> Isn't this the `completions-format' user option?

OK please mention completions-format on
(info "(emacs) Completion")

And on C-h m mode help:
 Completion List mode defined in ‘simple.el’:
 Major mode for buffers showing lists of possible completions.
 Type RET in the completion list to select the completion near point.
 Or click to select one with the mouse....