Hi Amanda,

Your screenshot works just as expected if I understand if correctly: the "II" is lookup result, the ""JR/SR/..." are existing choices, so when "Append choice" is selected, all options are listed, while when "Append choice" is not selected, only lookup returned value is listed.

As for the default selected value, it's not guaranteed that lookup value will be selected: it's selected when it's the only one choice, which is not true if "Append choice" is used.

If you would like the first lookup result to be selected, you could use custom script like this (need to update ruleId and field id):

$(document).on("lookupcomplete", function (event) {
  console.log(event.ruleId);
  if (event.ruleId == 1494) {
    $("#Field1").val($("#Field1 option:not(:empty):first").val());
  }
});