iPhone 7 question

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iOS & iPadOS

Hello
My friend has an iPhone 7 and she has a bit of sight left. For example: When she finds herself in any app for example: Whatsapp and double tapped on the: "Back" button, the screen goes dark. The only sollution currently for her is to turn the phone off and back on again. She uses VoiceOver and Dark Mode is turned off.

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