Are you able to highlight anything under and have the remove icon appear?
No, I can’t find anything that makes the button appear other than setting it to show only one runtime at a time.
But I guess I should have read the Help file first, for it actually says the same thing. It’s a bit unclear though for first it says that the button appears when any other runtime than the Poser default is selected. Later in the text however it appears that it means “selected in the “Show Library” drop down menu”, and not in the library itself.
Problem solved I guess. Thanks to all for your help….