I’m not sure you can, but it depends on where you left it. Some possibilities are described:
If you can’t find it, then maybe Import and export backup configurations can help to restart.
--settings-encryption-key=<key> is also allowed since 2.0.9.109_canary_2024-11-06:
--settings-encryption-key: Use this option to set the encryption key for the settings database. This option can also be set wit
h the environment variable SETTINGS_ENCRYPTION_KEY.
Encrypting database fields was 2.0.9.105_canary_2024-08-29 and either an environment variable or a default key based on the machine serial number, which unfortunately was not unique enough.
If you used the default key, I’m not sure if it’s saved anywhere, as it sounds like it’s just generated.
Possibly the developer can say more, but Canary is always subject to change as things are found.
If you have to, you can probably downgrade (might need special steps) to turn off encryption then rework it into the current plan. Make sure you store the secret key somewhere safe if you add one.