The Browser Width field under Advanced Web Page Options sets the size of the Browser used by Blitapp. Blitapp uses actual web browsers to capture sites. The Browser Width and Browser Height fields change the size of the Bowser window.
If the Browser Width field is set to 400, the width will be about the same as a mobile phone screen. But if you specify 2000, the view will be about the same as a desktop monitor screen. The resulting width of the screenshot capture will also be the same as what you specify in this field. The maximum width is 5,000 pixels.