@Vemo While we don't have a native app specifically for the Chromebook, you can try the Android Mobile app or the webapp in your Chrome browser: https://support.goto.com/meeting/help/about-the-web-app-g2m030003
Thank you for the reply.
I've tried the webapp and it does have an option to share screen but when selected it goes into a continuous death loop flicking between windows.
I'll try the Android app but I don't think it has a share screen option.
This really limits the use of GoToMeeting if you have people joining on a Chromebook (not uncommon)