How do I turn off the page thumbnails off by default every time a file opens

[Bill242704171bn4]

Does anyone happen to know how to change preferences so the page thumbnails left sidebar does not appear by default when opening files? Tks.

[try67]

There's no system-wide setting for that. It's up to each file you open whether to show this panel or not.

[try67]

However, if you select the option to restore the last view setting when re-opening files (under Edit - Preferences - Documents), I believe the panel will remain closed after the first time you open the file and close the panel manually.