The Select Dashboard listing displays the dashboard list to choose one and render in the viewer.
The Dashboard Layout options let you show/hide dashboard header, refresh trigger, and exporting options.
Widget Layout options let you show/hide the maximize option, filtered icon in the widget.
To explore this sample, choose a dashboard from Select Dashboard listing, check/uncheck the required options under Dashboard Layout and Widget Layout sections and click Apply. Now, the selected dashboard gets rendered in the viewer applying the selected settings.