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Turn off FileVault encryption on Mac
When you turn off FileVault, encryption is turned off and the contents of your Mac are decrypted. The decrypting could take a while, depending on how much information you have stored. However, you can still use your Mac to do other tasks while the information is being decrypted.
On your Mac, choose Apple menu
> System Preferences, click Security & Privacy, then click FileVault.Click the lock icon
to unlock it, then enter an administrator name and password.Click Turn Off FileVault.
Click Turn Off Encryption.