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I go to the preview of DDL ...I assume you are referring to use of the DDL Preview option from the context menu for a Table on the diagram?
Are you running the stand-alone version of Data Modeler, or are you using the Data Modeler features within SQL Developer?
What version of Data Modeler (or SQL Developer) are you using?
Please can you check whether any errors are reported in the log file.
For stand-alone Data Modeler, the log file is normally file datamodeler.log in folder datamodeler\datamodeler\log, and
for SQL Developer, it's normally file datamodeler.log in folder sqldeveloper\sqldeveloper\extensions\oracle.datamodeler\log.
Note that there is a forum specifically for Data Modeler issues: SQL Developer Data Modeler