Your request is not that clear, but based on what you provided so far, instead of relying on FetchXML to automatically include all columns, explicitly state each column you need in your FetchXML query.Dynamics CRM supports OData, which is a more flexible data access protocol and can be used to retrieve data.OData queries can be more detailed and less restrictive compared to FetchXML.
The Dynamics CRM SDK provides a rich set of APIs to interact with CRM data. You can write a custom application or script using the SDK to extract the data you need. This allows for more control and can bypass some of the limitations of FetchXML.