There is only one way to do this using acf functions. That is to loop through the repeater and output the row or field that your looking for. This can be done with counters
if (have_fields('repeater')) {
$counter = 0;
while (have_rows('repeater')) {
the_row();
$counter++;
// at this point the counter is set to the current row
// you can output content or not based on that row
// for example
if ($row == 4) {
// output content from row 4
}
}
}
You can also check values of the fields in the row to see if you want to show that row.
