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Collapsing an empty RG cell horizontally

I have a Repeating Group, and in each cell is a Group , within which is another Repeating Group.

When the inner RG has no results, I want the top-level RG cell not to show. I have already put the inner-RG in a Group, and set a conditional that when that RG has 0 results it should no be visible and that it should collapse (but vertically?) when not visible, which seems to be the recommended way to solve this.

However I still just end up with an empty gap in my RG, rather than closing the gap. Any idea how to fix this?