The TRONZ privacy protocol adopts a Bitcoin-like UTXO model. The balance of the shielded address exists in the note. Each transaction consumes the note generated by the previous transaction, and then generates a new note. The balance of the shielded address refers to all the unspent note collections belonging to the address.
You can click the token in your shielded address and click on the details under the balance tab to enter the note details to check the notes you have and their denomination.
Shielded transactions are currently only available on the Nile Testnet. You can connect to the Nile Testnet by selecting the Nile version in the "Settings" - "Switch between versions" or adding the Nile Test Node in "Settings - Node Settings".