How to make the heading navigatin side bar default once the document is open?

Document Server version:
9.2.1
OS:
Browser version:
chrome 148

is it possible to config it in the editor config?

Hello @softboy99

Unfortunately, no such setting is available. The enhancement to add a config parameter to define headings pane status is registered under the number 72044, I have added your query to it. I will keep you posted on the details.