It’s actually easy to hide the Pixel 3XL’s divisive camera notch from within your smartphone’s settings—but there’s a catch. Turning “off” the notch also disables the screen area around the notch that turns the uppermost slice of screen space into an unused black bar—it pushes the system tray and notification icons…
Source: LifeHacker – Hide Your Pixel 3 XL’s Camera Notch With These Settings and Apps