Unfortunately this is one of the things Apple won’t let us change. I hate the camera shortcut. I rarely use the camera at all. I’m constantly accidentally opening it, more often than not in my pocket.
It was worse on my old iPhone SE and 7 before that, now that I have a faceID phone I actually like the flash light shortcut, but I have accidentally turned it on.
I think there have been thousands of requests to Apple to let us customize those buttons but they haven’t seemed to give any thought to it.