Variable: reftex-toc-split-windows-horizontally
reftex-toc-split-windows-horizontally is a customizable variable
defined in reftex-vars.el.gz.
Value
nil
Documentation
Non-nil means, create TOC window by splitting window horizontally.
Probably introduced at or before Emacs version 22.1.
Source Code
;; Defined in /usr/src/emacs/lisp/textmodes/reftex-vars.el.gz
(defcustom reftex-toc-split-windows-horizontally nil
"Non-nil means, create TOC window by splitting window horizontally."
:group 'reftex-table-of-contents-browser
:type 'boolean)