Why does the options volume in a chart differ from other windows?

If the volume data in charts differs from the volume data in ticker rows or quote details, it may be because: 

• TWS charts only display the calculated volume
• In TWS ticker rows and Quote Details you can choose to show either the Native or Calculated volume. Do this in the TWS Global Configuration under…

An option chart may not display due to a lack of volume/actvity in the option. A work around would be to change your chart display from volume to midpoint, or to change the time frame to an expanded time frame…

To view Volume on a chart, click on the View menu item followed by Volume Subchart. The Volume will now populate at the bottom of your chart.

Note…

It is not possible to create a chart with bars of equal trade volume in Trader Workstation Charts at the moment.

For more information on how to show volume on a chart, see How do I display Volume on a chart in TWS?…