Alt + O (the letter O) and then take your finger off the alt key and press D. That will open the display window in the IDE. Try an 80 width and 25 height setting or smaller if it is that, already. Of course, from what you described, you might not be able to see and get to those input lines when the display window opens. I don't use a Mac, so I'm not sure why this happened to you, and someone else who uses a Mac may post a better solution. You may need to just re-install QB64, as an alternative.
Pete