Hi Ciaran
There is a minor bug in your Skylar_J4: When creating a menu item of type "Archived Articles", the down arrows are not visible:
With Cassiopeia, the arrows are visible:
Additional info: The browser console shows an error on that page (404 for https://systemtest.neudorf-mkk.de/templates/j51_skylar/css/images/select-bg.svg).
Regards
Rolf