How can I disable Guest Account in Chrome?

Google Chrome seems to have changed and it does not seem possible to remove the option to login as Guest.

There is lots of information on the web describing how to do this, but the posts are all old and Chrome has changed. Later versions don't have the options shown.

Can it still be done? My current version of Chrome is 64.0.3282.119 (64 bit)
Mike, January 2018