Yes. Because the setting is shared across Trader Workstation, IBKR Desktop, and IBKR Mobile, any change you make will be reflected across those platforms. Client Portal, which reads the shared configuration, will also apply the updated setting as long as its own ON/OFF toggle is set to OFF.
If I change the "Last Size Extra Decimal" setting in Trader Workstation, will it immediately affect IBKR Desktop and Client Portal?
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Where can I configure the "Last Size Extra Decimal" setting?
How do I turn off decimal formatting and return to integer display?
Does the "Last Size Extra Decimal" setting apply in Client Portal (CP)?
What is the “Last Size Extra Decimal” ON/OFF toggle in Client Portal, and what does it do?