Where can I configure the "Last Size Extra Decimal" setting?

The "Last Size Extra Decimal" setting can be configured in Stock presets in the following platforms:

  • Trader Workstation
  • IBKR Desktop
  • IBKR Mobile

Settings configured in any of these platforms are shared across all of them. A change made in IBKR Desktop will be reflected in Trader Workstation and IBKR Mobile, and vice versa.

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Where in the settings can I find the "Last Size Extra Decimal" option?
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?