Variable: ibuffer-use-other-window
ibuffer-use-other-window is a customizable variable defined in
ibuffer.el.gz.
Value
nil
Documentation
If non-nil, display Ibuffer in another window by default.
Source Code
;; Defined in /usr/src/emacs/lisp/ibuffer.el.gz
(defcustom ibuffer-use-other-window nil
"If non-nil, display Ibuffer in another window by default."
:type 'boolean)