A short update: You helped me create a query where only articles that the user does not yet have in their own list are displayed.
Now I have changed my mind and instead want these articles to appear in the list, but without the "add" button and a little toned down. This will be more user-friendly, I think.
I've been thinking about how to do this for a while now, but I can't get it to work. Also, I don't really understand the query you helped me with, because I can't change it using the query builder. I get the error message "Error Inspection SQL. Join table not found…”
I think that the query should show all articles. Then, inside the repeat list, you create two different show regions. One that displays items that the user has not yet selected and one that displays items that the user has selected.
