Is there a reason why you only have one collection?
It is like putting all your photos in one folder. Or better, have a single folder for all your bookmarks.
What is missing, is a feature to move an item from one collection to another. You can only move games left and right within the collection.
When adding a game to a collection that is already on your collection(s), you see what collections it is on. But have not button to remove it from one of those collections while adding it to another (which would be a move).
Also, if we add games to save for later, why are they added at first place. A viewlist is ordered fifo and not lifo. Or is there a button that I am missing, where you can configure a collection to be first in first out?