This bug has been added to the tracker:
https://winscp.net/tracker/1228
https://winscp.net/tracker/1228
Sorry for digging the post, but the way to show this column is simple, press "CTRL + NUM+"
HKEY_CURRENT_USER\Software\Martin Prikryl\WinSCP 2\Configuration\Interface\Commander\LocalPanel\DirViewParams
HKEY_CURRENT_USER\Software\Martin Prikryl\WinSCP 2\Configuration\Interface\Commander\RemotePanel\DirViewParams
HKEY_CURRENT_USER\Software\Martin Prikryl\WinSCP 2\Configuration\Interface\Explorer\DirViewParams