Hi Sheryl, Since a CP8 or a CP9 breakpoint project already has been designed custom to each breakpoint, we have given the option to keep it as it is, since it has already been created and finished. For new responsive projects, Fluid boxes will reduce the overhead of having to customize for each and every breakpoint. Only by setting some values in the Desktop view, you need not worry about how it will look on a device. The content will fit and adjust itself according to the device it is viewed on. If you have any doubts or queries, please feel free to email us at CaptivateHelp@adobe.com
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