With the fifth beta of iOS 18.1, Apple has made a small tweak to the Camera Control button that was introduced on the iPhone 16, iPhone 16 Plus, iPhone 16 Pro, and iPhone 16 Pro Max.
When you dig into the Camera Control settings, there is now a way to set it to the front-facing camera without having to interact with the iPhone's display.
To get to the selfie camera, open up the Camera app with a press on the Camera Control button, and then use a swipe gesture on the button to scroll through the lenses. The person icon at the very top swaps to the front-facing selfie camera.
Note that if you have Camera Control set to a different setting, you will need to open up the Camera app, activate Camera Control, and then tap on the screen to swap tools. The selfie camera and lens options are under the "Cameras" heading. The last tool you used will be the tool Camera Control opens with.
Prior to iOS 18.1, you could use this gesture to swipe through the different lens options, like 0.5x, 1x, 2x, and 5x (Pro only), but now it also includes the selfie camera to make it easier to get to all of the available lens options.
Source: Macrumors