How can I change commission structure on my paper trading account?

New paper trading accounts are set by default with a simulation of the Tiered pricing structure.

This set up can not be changed in Client Portal at the moment. You can request a manual change of the pricing structure to IBKR Client Services sending a ticket via Client Portal's message center.

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Information regarding the calculation of tiered commission monthly trade value
How do I obtain a lower commission rate?
Am I subject to the US stock commission schedule if I trade US stocks but am not a US resident?