Using the Reference Tree
You can access the Reference Tree from the Reference Viewer, which is a tool that displays a graph of asset dependencies. To open the Reference Viewer, right-click an asset in the Content Browser, and then click Reference Viewer.
In the Reference Viewer, if you right-click an asset in the graph to display its context menu, you can then click Show Reference Tree, which will display the Reference Tree for that asset.
For more information about the Reference Viewer, see Reference Viewer.
The initial load of the Reference Tree window may take several seconds, depending on how complex your game is and how many objects you have. Although the Reference Tree can be a useful tool, if you want to see the dependencies between assets, you may be able to find the information you want in the Reference Viewer itself, which typically loads more quickly than the Reference Tree.