So when I was on windows and working with a colleague I used to use Webex and would share my desktop, I could lock it down to showing only a single monitor - I can't find a equivalent on Ubuntu and was hoping someone could help...

My goal is to share only a single monitor ( I have two monitors currently setup in Ubuntu at present ). Ideally I'd like Remote desktop sharing to support selective sharing, but it seams to share the whole desktop so the viewer gets 2 1920x1080 screens side by side ... which can be unwieldy.

Is there any way to restrict Remote Desktop Sharing to this, or is there any other apps available that would do this?