How to change iPhone screen brightness?
When changing the brightness from the settings
This is how to change the brightness from the [Settings] of the iPhone.
Sliding the bar up → Brightens the screen. Slide the bar down → The screen becomes darker.
How to Auto Adjust iPhone Screen Brightness?
Slide to the left → The screen becomes darker. Slide the bar to the right → The screen becomes brighter.
See here for the True Tone settings. How to set the iPhone True Tone display (on/off)
