Variable: xref-truncation-width
xref-truncation-width is a customizable variable defined in
xref.el.gz.
Value
400
Documentation
The column to visually "truncate" each Xref buffer line to.
Source Code
;; Defined in /usr/src/emacs/lisp/progmodes/xref.el.gz
(defcustom xref-truncation-width 400
"The column to visually \"truncate\" each Xref buffer line to."
:type '(choice
(integer :tag "Number of columns")
(const :tag "Disable truncation" nil)))