I also tried a sample Project and a new Project (just created for testing this). The settings-box does not appear.
Thanks for your recommendations so far
This is not an issue I have seen and it is not one listed in Updates 1 or 2. If you have not already applied Update 2 (which includes Update 1) you could try applying that just to see if it gives RoboHelp a kick.
Otherwise I think I would go for an uninstall and reinstall. There is no setting for this issue and it is installation related rather than project related.
See www.grainge.org for RoboHelp and Authoring information

@petergrainge
Use the menu (bottom right) to mark the Best Answer or Highlight particularly useful replies. Found the answer elsewhere? Share it here.