What in the new PHPBB version triggers the board to select responsive formatting for mobile devices? I have iPad users who are telling me the site looks terrible. Testing on Chrome, emulating iPads, the site appears in mobile mode. But testing on an actual iPad, the site renders in non-mobile desktop mode, and I agree, it looks terrible. So what exactly is the code using to decide whether or not to format for a mobile device? Viewport size? User-agent string?