Hi Melissa–
Good question. All logs at the INFO level or higher are enabled by default, except for HTTP access logs, I think.
You can enable them 100% as described here in the docs: JSON Config Structure - Caddy Documentation
Enables access logging and configures how access logs are handled in this server. To minimally enable access logs, simply set this to a non-null, empty struct.
ServerLogConfig describes a server’s logging configuration. If enabled without customization, all requests to this server are logged to the default logger; logger destinations may be customized per-request-host.