settings.txt

{
    // Notebook
    // @jupyterlab/notebook-extension:tracker
    // Notebook settings.
    // **************************************

    // Code Cell Configuration
    // The configuration for all code cells.
    "codeCellConfig": {
        "autoClosingBrackets": true,
        "cursorBlinkRate": 530,
        "fontFamily": null,
        "fontSize": null,
        "lineHeight": null,
        "lineNumbers": false,
        "lineWrap": "off",
        "matchBrackets": true,
        "readOnly": false,
        "insertSpaces": true,
        "tabSize": 4,
        "wordWrapColumn": 80,
        "rulers": [],
        "codeFolding": false,
        "lineWiseCopyCut": true,
        "showTrailingSpace": false
    },

    // Markdown Cell Configuration
    // The configuration for all markdown cells.
    "markdownCellConfig": {
        "autoClosingBrackets": true,
        "cursorBlinkRate": 530,
        "fontFamily": null,
        "fontSize": null,
        "lineHeight": null,
        "lineNumbers": false,
        "lineWrap": "on",
        "matchBrackets": false,
        "readOnly": false,
        "insertSpaces": true,
        "tabSize": 4,
        "wordWrapColumn": 80,
        "rulers": [],
        "codeFolding": false,
        "lineWiseCopyCut": true,
        "showTrailingSpace": false
    },

    // Raw Cell Configuration
    // The configuration for all raw cells.
    "rawCellConfig": {
        "autoClosingBrackets": true,
        "cursorBlinkRate": 530,
        "fontFamily": null,
        "fontSize": null,
        "lineHeight": null,
        "lineNumbers": false,
        "lineWrap": "on",
        "matchBrackets": false,
        "readOnly": false,
        "insertSpaces": true,
        "tabSize": 4,
        "wordWrapColumn": 80,
        "rulers": [],
        "codeFolding": false,
        "lineWiseCopyCut": true,
        "showTrailingSpace": false
    }
}