Hi @AngBP thank you for sharing your feedback. All your trades will be converted to portfolio currency for tax and performance reporting purposes. The only way to stop the conversion is by creating the portfolio in your trading currency, but then it will impact the availability of your tax reports.
For AU tax reporting purpose, you do need to capture the value of each transaction translated to AUD using an applicable exchange rate, not just capture the value in the actual currency.
CommSec International is a rebadged subset of Interactive Brokers features. With a direct Interactive Brokers account, you could setup an IBKR to Sharesight data feed so that listed securities trades are automatically fed through next day, including the applicable IBKR exchange rate.
I am not sure if such facility is available through the rebadged CommSec International though.