How do I remove that extra column which displays ways to export PDF files & view my documents in full screen/full width, as before this last update? I went into TOOLS, PREFERENCES, and STILL could NOT find a way to remove that "EXPORT PDF" column.

How do I remove that extra column which displays ways to export PDF files & view my documents in full screen/full width, as before this last update?  I went into TOOLS, PREFERENCES, and STILL could NOT find a way to remove that "EXPORT PDF" column.

Before, whenever I opened up a PDF document, it automatically displayed in FULL WIDTH/FULL SCREEN mode.  Now, this terrible "EXPORT PDF" window opens up EACH TIME I open up a PDF file, and I have to click on that little arrow on the right of the page to get rid of that "Export Pdf" window.

It's driving me crazy.  This just started after this latest update to Adobe Reader.  Please help.