share screen

Can anyone help with this? I want to have two people on camera doing a role play, and an additional box, the same size (as if it were a third person on camera) with skills for them to be able to look at while they're working together. The rest of the meeting attendees would also be able to see both of them and the skills as well while off camera. I looked this up in settings on "share screen side by side" but I didn't have that option. Do I have to pay for an upgrade? I'd appreciate any ideas and clear step by step instructions if possible.

Thanks!