@jannem @kkarhan gnu screen does support multiple attachments when you use the correct arguments, and it has a shortcut to resize the screen window to the size of the current terminal. So, for you it would look like this: attach to the screen from two terminal windows, resize both terminals to their desired size. Choose the smaller one (probably the one on the presentation monitor) and hit Ctrl+a then F (like: fit to screen). If you're interested, I'll look up the details for you.