Try having a design open?
Thanks for the hint, but opening a desing doesn't help.
I can confirm that the same problem exists on older SQL Developer versions 19.2 and 18.3.
I've also tried to find this design level settings dialog in every other part of SQL Developer application, but without success.
It is hard to believe that something so important exists only in standalone Data Modeler, although Oracle's officialFAQ (https://www.oracle.com/tools/technologies/faq-sql-developer-data-modeler.html) says:
Q: Is the Data Modeler a part of Oracle SQL Developer?
A: Yes, the product is also fully integrated in Oracle SQL Developer.
Right click on the design in the modeler browser panel to access the Design level properties
Thank you so much!
Classic Oracle twist