Can anyone assist please?

The switch allows you to restrict what users will be able to access when dialling into your home network via the VPN Server.

If you set it to "Home Network Only" then remote users will only be able to access your home netwrok, and will need to disconnect the VPN in order access the internet on their remote device (Since a VPN routes all local traffic, internet or otherwise through the VPN).

If you set Home "Network + Internet" then remote users will be able to access the internet via your home network, something I would advise against unless you trust those who your going to be allowing acess to, since the responsibility for access to the internet and/or any services used by your clients, will fall on your shoulders, and not theirs (I'm thinking unsecured bittorrent access here).