The Asset Summary shows all the assets in your project, including those that aren’t being used in the effect. It’s an easy way to see which assets are impacting performance the most, and find any that aren’t being used.
To see the Asset Summary:
The Asset Summary shows all assets included in your project, with their sizes for each device type.
You'll see both downloaded and unpacked bundles for each device type:
If there are unused assets in your project, you’ll see the Review Unused Assets button:
Click this button to see and remove unused assets. If you delete a collection of assets, the folder containing the collection will be removed too. In the example above, deleting anchor and Heart would remove the 3D Objects folder.
If assets are referenced in a script, they won't be shown in the Asset Summary.