jupyterlab/packages/help-extension/schema/launch-classic.json

{
  "jupyter.lab.menus": {
    "main": [
      {
        "id": "jp-mainmenu-help",
        "items": [
          {
            "type": "separator",
            "rank": 1
          },
          {
            "command": "help:launch-classic-notebook",
            "rank": 1
          },
          {
            "type": "separator",
            "rank": 1
          }
        ]
      }
    ]
  },
  "properties": {},
  "additionalProperties": false,
  "type": "object"
}