Select an object in the Viewports > Main toolbar > Open Track View > Track View status bar > Zoom Selected Object
Graph Editors menu > Track View > Open Track View > Track View status bar > Zoom Selected Object
Use Zoom Selected Object to place the currently selected object at the top of the Hierarchy list.
Zoom Selected Object affects the Hierarchy list as well as the Edit window. (In the case of the Function Curve display mode, it only affects the Hierarchy List). This Option scrolls the Hierarchy to place the track of the currently selected object at the top of the Hierarchy list. If the object is a child of a closed hierarchy, the hierarchy is opened to display the selected object. If more than one object is selected in the scene, the uppermost selected object in the Hierarchy list is placed at the top of the list. If no objects are selected, nothing happens. This function works only on object tracks.
Note: You can also select an object in the viewports, and then right-click and choose Track View Selected in the dialog, to open Track View with the selected object placed at the top of the Hierarchy list.
Procedure
To place the selected object at the top of the Hierarchy list:
Select an object in the Viewports.
Open Track View, then click Zoom Selected Object.
The object is placed at the top of the Hierarchy list.
This option is handy to quickly find an object in a hierarchy, for example, a character's finger, and place it at the top of the Hierarchy List.
Interface
Zoom Selected Object: Places the currently selected object at the top of the Hierarchy List.