Hi Stephanie,
It seems the HP Envy x360 14t-fc000 has only the built-in 5MP front camera with no additional rear-facing lens, so there is no software or icon to flip the view. If your older Envy had a second camera, that would explain why you previously saw a switch icon. On this model, it is possible to connect an external USB camera if you need to capture what’s in front of the screen, but there is no built-in hardware option for reversing the camera direction.