Let’s say you create a bot that instrument a Chrome browser with Puppeteer using the code below:

const puppeteer = require('puppeteer');

(async () => {
    const browser = await puppeteer.launch({
        executablePath: '/Applications/Google Chrome.app/Contents/MacOS/Google Chrome',
        headless: false
    });
    const page = await browser.newPage();
    await page.goto('https://deviceandbrowserinfo.com/http_headers');
    await browser.close()
})();

You may notice that Chrome adds the following warning, Chrome is being controlled by automated test software , under the URL bar (cf screenshots below).

To remove the Chrome is being controlled by automated test software warning, you need to pass the ignoreDefaultArgs: ["--enable-automation"] parameter when creating the puppeteer browser instance:

const browser = await puppeteer.launch({
      executablePath: '/Applications/Google Chrome.app/Contents/MacOS/Google Chrome',
      headless: false,
      ignoreDefaultArgs: ["--enable-automation"]
  });

This parameter removes the Chrome is being controlled by automated test software warning (cf screenshot below). However, you should note that it doesn’t make your bot undetectable.