Hi,
You can find and clear the retained passphrase in the following locations:
OS X:
The encryption passphrase is stored, encrypted, in the OS X keychain. You can find it by searching for “odrive-encryption” in “Passwords”.
Windows:
The encryption passphrase is stored, encrypted, in the Windows registry. Navigate to HKEY_CURRENT_USER\SOFTWARE and look for the key(s) starting with “odrive-encryption”.