In a UTXO-based cryptocurrency like Bitcoin, a change address is an address to which the remainder of a transaction's inputs are sent after the desired amount has been sent to the recipient. This is used to ensure that the transaction has the correct amount of inputs to match the outputs, and to prevent someone from tracing a transaction by examining the input and output amounts.
In Trezor Suite, change addresses are automatically generated and used when a transaction is created. When you send a transaction from your Trezor wallet, it will automatically select the necessary UTXOs and send the desired amount to the recipient address. Any remaining balance will be sent to a newly-generated change address in your wallet.
The change address process helps to maintain the privacy of your transactions. It also helps to improve the efficiency of the Bitcoin network, as it allows for the re-use of UTXOs rather than creating new ones for every transaction. Trezor Suite doesn't show change addresses generated by the account.