Our primary focus when creating our mobile-responsive feature was to ensure that the desktop and mobile views were fully functional and completely customizable across as many devices as possible, with minimal work on our customers' part.
Responsive Layouts in Builder
There are two viewports in Builder: mobile and desktop versions of your landing page.
The breakpoint between these versions is 600px (when the landing page's view switches from desktop to mobile). What this means: any device with a viewport width wider than 600px will see the desktop version of your landing page, and any device smaller than 600px will see the mobile version.
What about a tablet device?
Since the default breakpoint is 600px, a tablet device with a viewport wider than 600px will see the desktop version of your landing page, and a device with a viewport smaller than 600px will see the mobile version.
As long as the 'Page Autoscale' box is checked in your Page Settings, the desktop or mobile version will be rendered to fit your device's screen.
Rest assured, all the content will still display on the tablet's screen. This will ensure that your page visitors will have access to the version of your landing page that works best for their device—regardless of what they're using.
To learn more about editing the mobile version of your page in Builder, see these articles: