I think that’s controlled by the “Synch” setting in the Single Source Layouts
This is related to the way Multiscreen HTML5 is created. What will happen is that the currently opened topic will be highlighted and the TOC expanded to that point. But that is all. No solution is possible within Multiscreen HTML5.
To solve the issue, you will have to upgrade to RoboHelp 2015 and switch to Responsive HTML5.
Sorry, missed the MultiScreen bit there – I was thinking WebHelp ;>)
Thank you very much for your responses - ah well, it was just a preference really and everything works ok otherwise.
Thanks again both!