Will I be forced to use FLUID BOXES in later releases of Captivate? I'm not sure they suit my project (or if I need more training)...

Afternoon,

I've been using Captivate 9 (and now version 10) for about 14 months now, so a relative newbie. I've created a number of training courses for a client, and more recently these have been responsive using the breakpoints.  I only upgraded to Captivate 2017 in November 2017 and I have, since then, watched countless videos about fluid boxes as I presumed as I am building responsive training courses I'll have to use these fluid boxes.  My client wants to maintain the look and feel of the courses I've done already and would like the courses to be available on anything from a phone to a laptop.  I'm failing miserably at mastering fluid boxes, to the point where I actually dread logging in on a morning.  The previous courses I've designed were really coming from a graphic design background - there's a lot overlaps and different coloured shapes and movement in the timeline.  I just can't seem to replicate this with fluid boxes.  What I've created looks very unprofessional.  I've experimented with making the boxes static etc. but this doesn't work and just creates a lot of white space in the mobile view.

My client doesn't care whether I use fluid boxes or breakpoint view just as long as the training works on multiple devices.  If I use fluid boxes I can't seem to create anything that's 'nice looking', if I use breakpoint I have to spend a lot of time reformatting for ipad and iphone (and I guess there'll be problems with learners who have less popular screen dimensions). I have no issue with the latter as at least I am producing something decent.

So, to cut a long story short, I think my only option is to use breakpoint view where I have complete control over my slide elements (how on earth do you add a shape to a fluid box without it resizing to fit the box?  Still not figured that out - even with padding it looks terrible).  But, how likely is it that Adobe will take away the breakpoint view on the next release and not support it?  If this happened my client would be left with nothing.  Should I just stick to breakpoint view?  Do I really need to master fluid boxes?

I've so far watched all the videos on Lynda.com, numerous YouTube videos (thanks Paul Wilson, eLearningBrothers and Pooja Jaisingh ), scoured this forum, played about for hours and I just don't get it with fluid boxes.  I've been waiting for my 'ah-ha!' moment since November and it hasn't arrived.

I'd really really really appreciate any thoughts on this please.  Or, if there's other training out there that I don't know about please can you direct me to that?

Many thanks, Heather