??? "More about preview results"
    The `PreviewResults` object returned by `client.data_designer.preview` stores all its fields in memory; nothing is persisted to disk by default.
    Use standard Python methods to save any preview data you want to keep around longer term.
    For example, the `dataset` is a regular Pandas DataFrame and can be saved to disk via methods like `to_csv` or `to_parquet`.
