Just tap there and it will appear
It appears on my s10+ when I click pretty much anywhere in the picture area.
It's more of a press than a tap. Hold your finger on the screen for a moment, and it will appear. I guarantee that it does work! Sometimes, you can adjust the exposure without doing this. Just press your finger on a dark object/area, and the exposure will change. Your picture will be brighter. The converse is true if your image is overexposed. Just press your finger on a lighter area.
Does your friend's phone have the latest OS and camera installed? Same version as yours?