Preface

When you work a lot with source blocks in Org Mode, the file can quickly become super long. For that reason, it's often very helpful to have certain source blocks start in a folded state. For this, I found the following function that automatically hides source blocks which have the keyword :hidden in the source block.

Example

(defun individual-visibility-source-blocks ()
  "Fold some blocks in the current buffer."
  (interactive)
  (org-show-block-all)
  (org-block-map
   (lambda ()
     (let ((case-fold-search t))
       (when (and
              (save-excursion
                (beginning-of-line 1)
                (looking-at org-block-regexp))
              (cl-assoc
               ':hidden
               (cl-third
                (org-babel-get-src-block-info))))
         (org-hide-block-toggle))))))

(add-hook
 'org-mode-hook
 (function individual-visibility-source-blocks))

print("hello world")

References

org babel - Choose individual startup visibility of org-mode's source blocks