How to prevent iOS from dimming or changing the screen brightness I have the "Display &amp; Brightness" feature of iOS disabled, and yet the device still dims to a brightness level that is unreadable after about 10secs of inactivity.. How do I turn this off?
iOS dims the display just before the Auto-Lock period.

You can set this period in Settings → General → Auto-Lock.

However, if Settings → Battery → Low Power Mode is set to on, the regular auto-lock setting is disregarded.