When you are composing transaction, you see on the right all output addresses. The change address is represented by path and it is sent by myTrezor wallet to the Trezor device as this path. This is why Trezor doesn't show anything, because it knows, it generates that address itself from the seed.
If the Trezor works with same algorithm - it's fine.
If the developer could confirm it ("The change address is represented by path and it is sent by myTrezor wallet to the Trezor device as this path")
Confirm. Trezor does not display those outputs which are provably going back to Trezor.
But as i wrote for other people can be strange that transaction has 2 outputs and they saw only one address & value when they signed the transaction.
No, it is strange to *you*, because you actually do expect that there's something called "change address". Btw displaying change address to common user has no sense, because user himself don't know if given change address is correct or not...