Turn Off Bookmarks on Side Panel (Adobe Pro)

I work with a team which everyone is annoyed by the bookmark panel always opening because we don't need it. We look at more than 100 of documents a day which non of them require us to look at the bookmark. Our PDF file is secured by our employer for different reasons. I've been reading on how to close, hide, turn off the bookmark tab futur documents tthat's always opening but no option is done for us and believe me the users NEED THIS. You have no clue how frustrating this is! Just to be more precise the document we are opening has about 20 to 30 pages so option of remembering in preferences what the -document -open setting(-restore last view settings when reopening documents) check box is not an option that works for us because we need every document to open on the First page and this remembers what EVER page you close or left the futur document will open that page. User wants max screen page without all the panels right or left to be opened when all we want to see is the document information. I work with Acrobat reader and Acrobat Pro and both have the same issue of not having the bookmark panel hidden when opening futur documents.