sharing screen

[LHTP]

We have pro version

When I share my screen to show Adobe Lightroom my participants can see my screen perfectly well, however when I select a tool in Lightroom to show how to edit a photo, the screen goes blank for my participants and a green border appears on my screen around the main part of Lightroom that I am editing 

Could anyone please advise 

When I select these tools, they do not open in a new screen, it is part of the Lightroom software I am using

I am not talking about the normal green border when sharing