Share screen problem

[MK18]

I bought a new laptop and I cannot share a screen like I used to. I click on Share screen and a box pops up: Entire Screen, Window, Microsoft Edge tab. 

In the entire screen I can see myself on screen. When I click Microsoft Edge tab a list of the sites I have comes up. When I click on the one I want to share it appears in a new screen not Zoom. On the Zoom screen it appears You are Screen Sharing band but it is very small. When I click preview nothing happens. 

What can I do?