Showing and Hiding Layers
You can also make layers visible or invisible over time.
To Change Visibility Over Time
1. Add the layer to a timeline.
2. Select the keyframe where you want it to be invisible.
3. In the properties panel, or in the layers panel set the visiblity to "hidden".
4. If you want it to be visible later in the timeline, add a new keyframe and set the layers visiblity to "visible".