Hi Ellen Austin,
Thank you for reaching out to us on Microsoft Q&A forum.
The confusion likely comes from the difference between the example and the screenshot. The 10 days in the example refers to the historical data range that will be included in the incremental refresh, while the 3 days in the screenshot refers to the refresh window, which is the period Power BI checks for updated data during each refresh.
Both values are valid, but they serve different purposes in the incremental refresh configuration.
If you are still facing any issue, please let us know in the comments and where you are encountering this error along with the screenshot for reference. We are glad to help you.
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