iOS/iPadOS devices use an ambient light sensor to adjust brightness levels based on the light conditions around the device, lowering brightness in dark locations and raising brightness in light locations. Unfortunately, when the iPad is placed in an enclosure that covers the light sensor (as is often the case in kiosk/cover use), the device will falsely believe it is in a dark location and can dim the screen, making the device difficult for visitors to use.
- in iOS/iPadOS 13, go to Settings > Accessibility > Display & Text Size > Auto-Brightness.
- in iOS 11 & 12, go to Settings > General > Accessibility > Display Accommodations > Auto-Brightness.
- in iOS 10 and earlier, go to Settings > Display & Brightness > Auto-Brightness.
- Let the auto-brightness do its thing by opening the device in a brightly lighted room
If that doesn't work:
- Ask your IT team to deactivate single app mode to change the settings
- Follow steps on top of this article