When I open any PDF in Acrobat, my page is cut down the middle with only the left half showing. There is a toolbar of sorts occupying the left side of the screen. I can click the 'x to remove this toolbar and I see the whole page, or I can re-size the window. However, after I close the window and view another document, the window size reverts to what it was and the toolbar re-appears. This is most annoying. I have looked for preferences to do with this or other features in the app but can find nothing to allow me to fix or manipulate this in any way. running on a PC with Win 10.