Hi,
Asset Viewer widget provide you to navigate when you click on device/assets.
Above configuration in widget configuration page is the navigation link mapping to detail page(dashboard).
Before configuring in widget configuration page, you need to create dashboard along with tab group from Settings-> General page as shown below.
Once you create dashboard, go to asset viewer widget configuration, and provide respective details such as dashboard Id, tab group, etc.
Post configuration, when you click on device/asset, it will navigate to detail page. Please make sure that device type is same as what you configured in configuration page.