iPhone X: How to disable auto-brightness

Instead of letting the iPhone X automatically adjust how bright your display needs to be, Apple has tucked a toggle to disable auto-brightness into the Settings app.

It's a bit hidden, but here's what you need to do: Open Settings > General > Accessibility > Display Accommodations and slide the switch next to Auto-Brightness to the Off position.

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Pay close attention to the warning just below the toggle. Because the iPhone X uses an OLED display, screen burn-in is inevitable, and by disabling auto-brightness you can potentially cause harm to your screen. It's up to you, of course, to decide if the risk is worth it.