Hey @paulchiao ,
Set the field width of the first four fields to something like 49% (or less, if you want a larger gap) and the field alignment to "space-between as already mentioned.
Or use the custom CSS solution (updated to the new root syntax):
%root% {
column-gap: 20px;
}
%root% .form-group:nth-child(-n+4) {
width: calc(50% - 10px);
max-width: 100%;
}