thats how i set it up, but the cut off curves still remain visible. is there a possibility to discard/delete that data? or is this just done withe the 'preview' function?
It's never possible to delete existing data. All you can do is create a new list of items that doesn't include the ones you don't want. If you don't want to see certain curves, you'll need to switch off the preview for those components/parameters that contain those curves.