To turn on Guided Access on your iPhone 12, follow these steps:
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Enable Guided Access: Go to Settings > Accessibility > Guided Access. Toggle the Guided Access switch to the "on" position (green).
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Set Passcode Settings: Tap Passcode Settings, then tap Set Guided Access Passcode.
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Enter a Passcode: Enter a passcode you can remember, and then re-enter it to confirm. You can also choose to use Face ID as an alternative to the passcode.
Once enabled, you can start Guided Access within any app by triple-clicking the side button (or the Home button on older iPhones). This will restrict the iPhone to a single app and allow you to disable certain features.