Set initial tree visibility

The Org-mode manual indicates these possible values for initial visibility:

#+STARTUP: overview
#+STARTUP: content
#+STARTUP: showall
#+STARTUP: showeverything

With the following meanings, according to the summary of in-buffer setting:

overview         top-level headlines only
content          all headlines
showall          no folding of any entries
showeverything   show even drawer contents

Source

Set elisp variables for files

Add sth like that on beginning of a file

-*- mode: org; +jupyter-kernel: kernel1; +jupyter-session: session1; -*-