Maybe you also want to change the values of your choices, it's not best practice to use spaces, stripes, etc.. So use new_hire, non_employee instead.
Just tested with code below, works fine:
function onChange(control, oldValue, newValue, isLoading) {
if(isLoading || newValue == '') {
return;
}
var reqFor = g_form.getValue('request_for_new_hire');
if(reqFor == "No") {
g_form.removeOption('employee_type', 'new_hire');
} else {
g_form.addOption('employee_type', 'new_hire', 'New hire');
}
}
