There are a few steps by whichyou can share screens on facetime on your apple devices such as iPhone, MacBook or iPad, etc.
Call the person: Make a call to the person you want to facetime with.
Click on the control center: When you are on call swipe up the bottom to reveal the control center from the< click on the control center in the menu bar on your gadget.
Click on the screen sharing button:After going to the control center look for the SCREEN MIRRORING icon and click on it.
Select the device: After pressing the screen mirroring button select the airplay 2 or device your want to share your screen with and enable the device.
Screen Shared:After the selection, the call starts mirroring the person’s gadget.