In all linux distributions, files/directories that start with a . are hidden. I don’t use Windows, but there must be a way in winscp to show hidden files,
In all Linux distributions, the password is not echoed back when you type it in, so it seems to not work. This is done on purpose. Be aware that root has the power to do anything on your system so be very careful when running it. I’ve seen to many people ruin their systems by running a command that won’t do anything as a normal user, but when run as root it can have pretty drastic consequences.
Thank you for your warm warning. I do not play with root user, i only wanted root because i wasnt able to change / rewrite configuration.yaml with PI user