Within this, repeating group, there is no gap spacing option. All the elements are within a group and there is a 5px row gap applied. But, the individual cells are sticking together and unless I apply margin, it doesn’t separate. Margin causes misalignment with the sort button above.
Just set its colour to transparent, and its width to whatever you want the spacing to be.
(this prevents padding/spacing being added on the outside, which will happen if you use padding or margins on the internal group, which can mess up responsive layouts).