■

xyzzyはドキュメントがemacsほど整理されてないのがちょっとあれ.なんの関数が使えるかとかちょっと探すのに困る.

行番号とかスペースの表示とかを切り替えるのはwindow.lの担当らしい.
$XYZZY/lisp/window.l

(export '(count-windows pop-to-buffer other-window move-previous-window
	  *pop-up-windows* display-buffer
	  split-window-vertically shrink-window
	  enlarge-window-horizontally shrink-window-horizontally
	  pos-visible-in-window-p recenter
	  *window-flag-line-number* *window-flag-ruler*
	  *window-flag-newline*
	  *window-flag-tab* *window-flag-zenkaku-space*
	  *window-flag-mode-line* *window-flag-vscroll-bar*
	  *window-flag-hscroll-bar* *window-flag-eof*
	  *window-flag-fold-line* *window-flag-cursor-line*
	  *window-flag-fold-mark*
	  *window-flag-half-width-space* *window-flag-full-width-space*
	  *window-flag-just-inverse* *window-flag-alternate-vscroll-bar*
	  *window-flag-scrolling*
	  toggle-line-number toggle-ruler toggle-newline toggle-tab
	  toggle-zenkaku-space toggle-full-width-space
	  toggle-vscroll-bar toggle-hscroll-bar
	  toggle-eof toggle-mode-line toggle-function-bar
	  toggle-fold-mark toggle-fold-line toggle-cursor-line
	  toggle-half-width-space
	  buffer-fold-width
	  split-window-menu-update
	  close-window-menu-update
	  move-window-menu-update
	  set-buffer-fold-type-none
	  set-buffer-fold-type-window
	  set-buffer-fold-type-column
	  set-buffer-fold-type-none-update
	  set-buffer-fold-type-window-update
	  set-buffer-fold-type-column-update

↓コピペお試し用

(toggle-line-number)         
(toggle-ruler)               
(toggle-newline)             
(toggle-tab)                 
(toggle-zenkaku-space)       
(toggle-full-width-space)    
(toggle-vscroll-bar)         
(toggle-hscroll-bar)         
(toggle-eof)                 
(toggle-mode-line)           
(toggle-function-bar)        
(toggle-fold-mark)           
(toggle-fold-line)           
(toggle-cursor-line)         
(toggle-half-width-space)    

引数を与えない場合トグル.引数t or nilを与えてやるとトグルじゃなくてonかoffにできる.それ以外の引数の場合どうなるかは何かで読んだ気がするけど忘れた.
foldなんたらは環境によってはわかりにくいけど行折り返しに関する表示の切り替え.