Can I change the viewport size same to window inner size with Puppeteer helper?

Details

• CodeceptJS version:1.3.3
• NodeJS Version:10.8.0
• Operating System: Macos
• Protractor || WebDriverIO || Nightmare version (if related): Puppeteer 1.8.0
• Configuration file:

  helpers: {
    Puppeteer: {
      url: cf.testDomain,
      show: true,
      restart: false,
      keepCookies: true,
      windowSize: '1920x1080',
      chrome: {
        defaultViewport: {
          width: 1920,
          height: 1080
        },
        handleSIGINT: false,
      },
    },
  }

In the codecept.conf.js file, I set windowSize and defaultViewport with the same value, but when I run test test suite:

• The viewport size of chrome is still 800x600.
• The window inner size of the webpage is 1920x1080. This is not convenient to debug by viewport.

[PeterNgTr]

   Puppeteer: {
      url: 'https://google.com',
      restart: false,
      keepBrowserState: true,
      keepCookies: true,
      fullPageScreenshots: true,
      show: true,
      windowSize: '1440x700',
      waitForNavigation: ['networkidle2', 'domcontentloaded'],
      waitForAction: 1000,
      chrome: {
        args: ['--no-sandbox', '--window-size=1440,700'],
      },
    },

This works fine for me.

[mystic-poet]

Any solution to this? I tried updating the codecept.conf.js file, but it did not help.