Collapse and expand layers

You may want to quickly collapse a layer to hide its events in order to focus on other layers.

You can do that by clicking the up/down arrow beside the layer's name on the timeline:

Collapsed layers continue to be displayed when you export your timeline as an image or PDF or share it with others. Think of it as a way to view fewer layers while you're working on your timeline, but not as something that impacts how it is seen by others.

To hide a layer from others, use the Hide Layer feature.