How to wrap code/text in Jupyter notebooks

Find your configuration directory via jupyter --config-dir (mine is ~/.jupyter). Then edit or create nbconfig/notebook.json to add the following:

{
  "MarkdownCell": {
    "cm_config": {
      "lineWrapping": true
    }
  },
  "CodeCell": {
    "cm_config": {
      "lineWrapping": true
    }
  }
}

(If you have something else in it, ensure you have valid JSON with no trailing commas after }s.)

Restart Jupyter and reload your notebook.

Source: https://github.com/jupyter/notebook/issues/106