Disabling / Hiding Tools Pane in Acrobat DC Pro

I have seen many discussions relating to hiding the tools pane but am unable to find where this has been answered for DC Pro.  I am required to close the tools pane each time I open a document.  The program does not "remember" this setting and unlike DC reader, the setting checkbox is not in the preferences (Edit, Preferences, Documents, ....)  I am not sure if there is an update I am missing or if a fix is still not out for this particular issue yet.  Can someone please tell me if you have found the answer to this?