Hi Bjorn,
In order to make this work you need to write some custom CSS.
The dropdown icon is in fact a background image if you inspect the Reference Selector element.
To hide the background image, add the following line of code to one of your SASS files.
.refselectornoicon {
.form-control {
background-image: none;
}
}
Give the Reference Selector the class refselectornoicon like this:
Now you should be all set.
Hope this helps. Please let me know if you need any more help.