Multiple Pages in Web Output

Hello,

PTC Arbortext Editor version 8.1.3.1.

I have a DITAmap document which includes several chapters.

Each chapter has a bunch of topics/concepts.

Each topic/concept is in a separate dita file (see example screenshot below).

In Web output, topics are displayed in the right side all together (see next screenshot below).

When a topic is selected in the left menu, the right page scrolls to the selected topic.

I need the right page to display only the content of the selected topic, as in a real navigation menu.

How to do that?

Best,

Pietro