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Click on empty space and choose 'View Details'. Then deselect 'Schema'
Dimitar's answer will stop the schema name being displayed on the diagram.
If you don't want the schema name to appear in generated DDL,you can unset the "Include Schema in DDL" option on the Data Modeler/DDL page of the Preferences (which can be accessed from the Help menu).
...from Tools menu, I think.
Thanks for your help.
I will use both options: Dimitar's and David's