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Struggling Conditional Visibility on a slider with CMS

Hi Guys

This is my first attempt at a webflow CMS and I;m having some issues.

Does anybody know how I can get a slider to show content only if has been added to the Collection?
My issue is that I have a case study page template, they have different people assigned to each case study, there is only a mximum of 4 people ever but 80% 2 people. I have a slider with 4 slides and was hoping to use conditional visibility to just show the required number of slides for each project page… in theory it makes sense… but I can’t get it to work… I just content duplicated or just empty slides

could somebody help me please?

Link to site:

Preview Link:

Anybody out there a Webflow CMS whizz that could maybe help me with this?