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As per the issue description mentioned above, you want to hide the navigation pane in the left hand side of the application, is that correct?
Could you try the troubleshooting steps given below:
Click on the arrow to hide the navigation pane.
Go to Edit>Preferences>Documents> Under Open settings check "Restore last view settings when reopening documents"
Close Application and relaunch it.
Reopen document, the side bar should be hidden now.
Let us know if you need any help.
Looks, that it works, but partially. It works, if I reopen the same document.
It does not work, however, for any new document for which I have not closed navigation pane before. And I open lots of documents, mostly for reading, not editing. Often side by side with another applications/windows. As result often nav panel occupies 1/3-1/2 of Acrobat window width and document itself is zoomed so small, that I very often have to take unproductive steps of closing signatures or bookmarks pane.