When you click on the "?" field in a dialog, no help menu is shown. The mouse icon changes its appearance to a red crossed circle and when you click somewhere in the dialog it changes back.
- Go to the segmentation tab
- Create a segmentation (e.g. with the 3D Threashold tool)
- Click "Confirm segmentation"
- In the dialog, click the "?" on the top
This happens in every dialog, not only in the segmentation dialogs.