VERIFIED SOLUTION i

Resolve Portrait Dialogue - Support for mobile devices

PD 6.1 is the first version of PD to support Responsive design "Fluid Containers".
In the Portrait Dialogue (PD) 6.1 Release Notes document,

There is a section titled "Enhanced support for mobile devices in emails" which starts on Page 18 with:
Portrait Dialogue 6.1 comes with several enhancements to better support mobile devices through responsive
design for email.
Fluid Container
In Emarketing emails, Container item types have been enhanced with an option for fluid rendering. This
means that columns can automatically be stacked on smaller screens, while still display side-by-side on
larger screens.

There is a section titled "Enhanced support for mobile devices on web pages" which starts on Page 21 with:
Portrait Dialogue 6.1 comes with several enhancements to better support mobile on web pages displayed
to the end-customer. These improvements are in the HTML rendering of Customer Web Access (CWA)
web application and aims for better display on various screen sizes.

The PD 6.1 Release Notes pdf file is attached to this article
UPDATED:  April 21, 2017