Encryption in LAN: not possible according to manual, but enabled by default?

Hi,

the user’s manual tells that in “LAN mode” no encryption of the file traffic would happen. I would really dislike this, I think for me it would mean I could only use the “Internet” mode.
However, in the client settings there is an option related to encryption for both LAN and Internet modes and I hope it could just be that the users manual is outdated maybe?

Steffen