to hide the left pane
For Acrobat DC (Ver 2015.008.20082 for my case) & Windows 10, registry path is slightly different.
HKEY_CLASSES_ROOT\Acrobat.Document.DC\shell\Open\command
String to be modified is similar.
"C:\Program Files (x86)\Adobe\Acrobat DC\Acrobat\Acrobat.exe" "%1"
to
"C:\Program Files (x86)\Adobe\Acrobat DC\Acrobat\Acrobat.exe" /A "navpanes=0" "%1"