There’s a setting “Require Attention for Face ID” that controls this. It’s enabled by default, but if you’re unable or find it difficult to look directly at the

There’s a setting “Require Attention for Face ID” that controls this. It’s enabled by default, but if you’re unable or find it difficult to look directly at the sensor (or wearing sunglasses that block IR) you can turn it off and make it behave like the Pixel. You can even point it at your face while looking away, and it won’t unlock until you make eye contact.