Feedback window (alias console window).
File
Preferences.
Click the "More Preferences" link
Should open a file menu
Double click the preferences file and it should open in notepad (or similar)
Change Console Lines from 4 (default) to something that you like.
Be careful with the settings in here as you can end up with a misbehaving IDE if you are not careful.
Suggest you make a copy of the preferences file FIRST in case you get carried away.