How does one change the default behavior in Polyglot Notebooks so that inside a Code or Markdown cell a SHIFT-RETURN yields a newline. A RETURN would do what a SHIFT-RETURN used to do. RETURN would now, not yield a newline but instead, close the cell.
This is how Slack and every other chat-like app I use behaves and I'm constantly mixing up the behavior when working in Polyglot Notebooks.
Thank you!