truncate-line doesn't work

[hvkwak]

Hi, thank you for this repo very much!

Please note that I have limited emacs experience. I was dissapointed with speedbar (especially due to its window width 50 issue). I am trying to fully show the current directory now using emacs-neotree, only to find truncated directory with an arrow as shown in this image:

Here's part of my init.el, where (setq truncate-lines nil) doesn't work. (add hook neither. I think I am missing something.) Any suggestions? Thank you!

(use-package neotree
  :ensure t
  :config
  (setq neo-window-width 40)
  (setq truncate-lines nil)
  )