There are several ways to get to the inventory from the dashboard - it depends what you are investigating that determines efficiency.
All of the information and icons in the "Inventory" section are links to that specific filter within the inventory. For example, if you wanted to only look at your AWS accounts, simply click on that icon and it'll filter out your Azure, Office365, GCP, and HoB content.
Similarly, how you can quickly dive into the inventory by cloud or cloud account above, you can also click on one of the top 10 resources across your environments to being investigating. 
- You can also always click "Inventory" from the navbar as well.