.jupyter/lab/user-settings/@jupyterlab/apputils-extension/notification.jupyterlab-settings

{
    // Notifications
    // @jupyterlab/apputils-extension:notification
    // Notifications settings.
    // *******************************************

    // Fetch official Jupyter news
    // Whether to fetch news from Jupyter news feed. If `true`, it will make a request to a website.
    "fetchNews": "false"
}