To remove a column, simply right click on the column header and select Delete Column. However, please note certain default columns such as Action and Type (among others) cannot be removed.
How do I remove a column from the Activity monitor in Mosaic?
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Can I add or remove columns to the Option Chains panel in OptionTrader?
How do I remove the Ticker Action column from my TWS page?
Can I add or remove columns from the Orders and/or Trades tab in the BookTrader?
How do I remove a column from my TWS page?