Option 1 - Device setting
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Launch the Settings app on your iPhone or iPad.
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Tap on General.
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Now choose the Auto-Lock option.
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Tap on Never.
NOTE: After a presentation the screen lock can be enabled again.
Option 2 - nextINTERACT setting
If you use nextINTERACT for presentation, you can disable device screen lock by following these steps.
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Launch nextINTERACT
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Tap on [Settings] in nextINTERACT
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Tap on [Assistive Features], then enable Standby mode
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This will prevent nextINTERACT, as well as the device to lock the screen.