Showing lots of details in one page of BI report is usually not a good idea, to provide a better experience for report viewers, users have to create multiple pages of different visuals in their reports. This can solve some problems of telling a story about data but it is much more useful if users be able to have some kind of connection between these pages to tell a continuous story.
For example imagine a report with page of visuals about total sale of products, if user wants to get into detail sales of each specific product they need to create another page in their report to show details about that. Without having a proper connection they cant transfer the selected product to details page. They have manually do this every time they want to show details of a specific product.
This scenario helps them to create this connection in an easy way, just by selecting a product in their page then can easily get more details about that specific products with two mouse clicks.
You can learn more about this feature by clicking here.