To fix this, you can do the following:

  1. Download this light.zip file.
  2. Exit PL/SQL Developer.
  3. Go to %APPDATA%\PLSQL Developer 15\Preferences\Themes
    (e.g. C:\Users\<your user name>\AppData\Roaming\PLSQL Developer 15\Preferences\Themes)
  4. Unzip the downloaded light.ini file to replace the existing file.
  5. Restart PL/SQL Developer.


Marco Kalter
Allround Automations