Incase if you are not able to connect via double click method, try from the left side: properties menu → Entity Path
Hey Nalin Diri,
You can connect your entity to your list view by 3 methods..
1. Using the List view configuration pop up page.
2. Using the Properties Tab
3. Using the Connector Tab
You can find Properties and Connector tab by navigating to View from the Menu bar
Hope this helps you.