?? np.abs          # opens window with definition of function and full source code

Shift-tab

ESC    # to enter command mode on a cell

m      # convert cell to markdown

ENTER # to enter edit mode

Shift-Enter : Run a cell

Disable word wrapping https://stackoverflow.com/a/39398949/715483

$ jupyter --config-dir

$ vim nbconfig/notebook.json

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

Increase cell size to 100% https://stackoverflow.com/a/24207353/715483

mkdir  ~/.jupyter/custom

vim ~/.jupyter/custom/custom.css

.container { width:100% !important; }