A user defines a custom field in Data Change Request (DCR) with a default value. The default value is not displayed in a new DCR page.
The New DCR page is implemented by a Visual Force page. The Visual Force page does not support displaying the default value.
As a workaround, please use Help Text at field level for the disclaimer. Refer to the related documentation for more information.
Salesforce Help: Define Field-Level Help
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