Hello San,
I do plan to provide some reporting capabilities as to what fees are paid. This will probably be somewhere in the admin dashboard.
As users perform internal transactions, the total user balance does decrease (as shown in the adapters list), while the wallet balance remains the same, as expected.
If you do not see this change, perhaps you have not set any internal transaction fees? If you are using the CoinPayments adapter, the internal fees are set to 0 by default, but you can set them to something else.
kind regards