Question about Tefal Snack Collection SW852

We used the big toast (American) from Lidl, but the smaller ones from Migros, both work very well.

The size is intended for the American sandwich, which works very well. I honestly haven't tried it with the smaller toasts, but I assume that they are not optimal. Because the edges are not sealed properly. But...I haven't tried it yet.
Extra tip: Don't overfill the toasts... it makes a big mess ;-)