Hi Tanya,
A responsive project when created with a former version will remain in Breakpoint view mode, not be converted to Fluid Boxes work flow. Both work flows are still possible. I gave some reflections about them in: Captivate 2017's gems - Captivate blog and specifically for Question slides in Tips for 'Fluid' Quiz Slides - Captivate blog
Both work flows have their advantages. Once you master the Fluid boxes, and adapt its way of designing, you'll be able to create a responsive project much quicker, but you'll lose the granulary control you can have with breakpoint views like different layouts for mobile. Text handling with FB's is much better than with breakpoint views where the font size remained fixed in between two breakpoint views (you had to set up the font size for each breakpoint in the Object style), with FB's you don't have that problem, text resizing is smoothly. However there are some restrictions with the normal real fluid FB's: no overlapping objects is one of the most limiting, because it also applies to objects in the same physical location but in different times. You cannot have a caption on top of a shape, a click box on top of an image, unless you convert the Fluid Box to a Static Fluid box (which are not so fluid). You can make objects optional (will disappear for smaller screens), but you cannot choose to replace an object by another one as is possible with Breakpoint views. Conclusion: for very controlled design, keep to Breakpoint views, for saving time and smooth text handling, leaving more design control to Captivate, choose Fluid Boxes. These are my personal reflections, probably other users have different opinions.
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