How to remove window tabs?

[lost]

Hello!
Trying now PLSQLDev13, but I prefer an old-style interface and appearance.
So, tel me please, how can I remove the window tabs, that wastes a lot of screen space? I would continue to use "window list".

 

[Marco Kalter]

To revert to the old-style (pre 12.0) user interface:

1. Go to the "View" ribbon and disable the "Single Document" option.
2. Go to the "Configure" ribbon, select Preferences > User Interface / Appearance, scroll to the bottom, and press the "Switch to Menu" button.

 

[lost]

It helps. Thank you very much!