Forget stored passphrase on a computer

[Tony]

Hi @yuallen,
Take a look at this post here:

Encrypted folder:remove "cache" passphrase

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”.