Hello @PragmaLab,
Unfortunately, as you mention, the window of Code can not be resized, nor modify in any way.
Thanks for pointing out the issue. We will let the team in charge to know about this, hopefully in next releases windows can be resized, and/or detached/docked.
Finally, as a recommendation, you could try writing the code first in other IDE, and then copy and paste it in the Code Window.
Best regards, Raul.