I haven't found a setting in Zotero 7 and maybe there isn't one yet. But it would be convenient to indicate when selecting a publication/item in the main library in which collection(s) it is already. Currently, I can check this by trying to drag and drop it to a collection which is not possible when already included, but i'd prefer some highlighting indication without the need to try drag&drop.

Any suggestion if this is already possible (a setting I missed?) or if this can be something that could be enhanced?