In the loadout overview it works perfectly with the red rectangle and the loadout count on the loadout card if there are multiple ones of the same type.
However in Trade-up this isn’t the case anymore. So I have to note down which specific loadout is doubled and then manually dig through the dump in Trade Up.
As I feel it is even more important to know of which I have multiples when trading, as you want to get rid of those first, I would really appreciate that display option there as well.
Cheers