The option is buried under the Camera Settings > Advanced menu. The trick here is understanding when you see the benefit.

Online forms are an excellent way to conduct research, collect feedback, test knowledge, and more. Here’s how to use Microsoft Forms to create surveys, feedback forms, quizzes, and other interactive ...

When enabled, your iPhone will detect if its camera lens is smudged, and your device will tell you to clean it to improve your image quality. It's a nice way to make sure you always get a good picture ...