Variable: speedbar-prefer-window
speedbar-prefer-window is a customizable variable defined in
speedbar.el.gz.
Value
nil
Documentation
If t, the command speedbar opens the speedbar in a window.
This variable was added, or its default value changed, in Emacs 31.1.
Probably introduced at or before Emacs version 31.1.
Source Code
;; Defined in /usr/src/emacs/lisp/speedbar.el.gz
(defcustom speedbar-prefer-window nil
"If t, the command `speedbar' opens the speedbar in a window."
:type 'boolean
:group 'speedbar
:version "31.1")