Hi,
I am using SQL Developer 18.3 and it doesn't show DBMS Output.
Database version: 12.1.0.2.0

However, if I run the same on SQL*Plus for the same schema and database, it runs fine:

Moreover, if I connect to another database also version 12.1.0.2.0 on the same SQL developer, it runs fine:

Am I missing some configuration?
Regards,
Susana