This function enables you to preview the widget's functionality or the entire dashboard content at runtime. 

You need to navigate to the Administration > Dashboard Widgets page. 

The Dashboard Widgets UI is displayed as shown below. The widgets are organized and displayed in a table with columns for display name, description, and validation status. Use the Search box to filter the list.  

Choose the dashboard widget from the list and click the View - Preview menu option. 

The Widget UI Preview pop-up shows the widget functionality as follows. Click the Close button to proceed.