I'm not sure if this is a bug or a feature request so I've posted here. Viewer & Host versions 18.104.22.168
If you set "Lock Workstation on Disconnect" in the additional properties of a connection, the Host screen will also lock when using View Only mode.
By my definition, View Mode should not have any control over the desktop, so should not lock the screen on disconnect if set in the properties, since it is an action of control.
If this is by design, it should be given a suboption to not lock for View mode sessions. Take for example, a user wants to show you something on screen while on the phone. You connect with View mode, discuss with the user, then disconnect. Their screen will lock and they will have to unlock it. Inconvenient for the user and unnecessary.