add org-fragtog

settings/org-settings.el

@@ -260,6 +260,7 @@ Example defines
   (setq org-pretty-entities t)                     ;; see also `org-appear' and [C-c C-x \] (`org-toggle-pretty-entities')
   (setq org-pretty-entities-include-sub-superscripts t)  ;; if `org-pretty-entities' is active include also sub-superscripts.
   (setq org-image-actual-width '(600))             ;; image width displayed in org
+  (setq org-startup-with-latex-preview t)          ;; #+STARTUP: latexpreview|nolatexpreview
   (setq org-format-latex-options
         '(:foreground default
           :background default
@@ -490,6 +491,10 @@ Suggest the URL title as a description for resource."
               (list ?4 :foreground "green1")
               (list ?I :foreground "#df5f5f" :weight 'bold))))
 
+(use-package org-fragtog
+  :after (org)
+  :hook (org-mode . org-fragtog-mode))
+
 (use-package org-id  ;; used by org-brain
   :defer t
   :config