In the Project Overview web interface, in the Clusters pane, four of our clusters are listed. I am new to our MongoDB deployment and to this UI. I had no way of concluding we had more than four clusters. I thought that was the complete list.

I feel strongly that if you are going to show only a subset of clusters in a UI, you need to also give users some visual clue that this is only a subset, that the list is incomplete, and that more can be found somewhere.