in the preferences there are two nodes "Code Editor".
Screenshot see http://matzberger.de/oracle/4EA1-preferences.png
When you have decided which node will be in the next EA version, then I will discuss again why "Zeilenzwischenraum" is not a good name
Edit: when I set the GUI-language to en in sqldeveloper.conf (AddVMOption -Duser.language=en), then there is only one node
Another issue: I'm missing the node "Extensions" to deactivate unused extensions like TimesTen, Migration of Access/MySql...