Timeline - Hide All Others

The Hide All Others command turns off the display of all unselected elements. You will not be able to see hidden layers as you work in the Camera View, Side View and Top View windows.

Use one of the following to activate this command:

Select Element > Display > Timeline > Hide All Others.
Click the Contextual Menu button in the Timeline window and select Display > Hide All Others.
You can also turn off the display of elements in your animation with the Show/Hide buttons in the Timeline window.