You can tag layers to easily visualize them in the Timeline view.
 How to tag or untag elements in the Camera view
How to tag or untag elements in the Camera view
                                                            - In the Camera view, select one or more elements.
- Right-click and select Tag or Untag.
                                                                     
                                                                
 How to tag or untag elements in the Timeline or Node view
How to tag or untag elements in the Timeline or Node view
                                                            - In the Timeline or Node view, select one or more elements.
- Do one of the following:
- Right-click and select Tag and one of the following:
- In the Timeline or Node view menu, select Edit > Tag and one of the following:
- Timeline Tag: Tags selected elements in the Timeline or Node views.
- Timeline Untag: Untags selected layer in the Timeline view.
- Timeline Untag All: Untags all tagged elements.
- Timeline Untag All Others: Untags all elements except the selected one.