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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.
Open the FileVault pane for me
If the lock at the bottom left is locked , click it to unlock the preference pane.
Click Turn Off FileVault.
Click Turn Off Encryption.