There is not much you can to with repeaters displayed as tables because, well, they are tables. In order to do this you need to choose a different display, block or row. It may be possible to alter the way tables behave by altering the “display” property of the tables, rows, cells, etc, but I’m not sure.
Welcome to the Advanced Custom Fields community forum.
Browse through ideas, snippets of code, questions and answers between fellow ACF users