Layers allow you to group similar types of events together on your timeline. 

For example, in a timeline about your life, you might have one layer for places you've lived, one layer for places you've worked, one for your relationships, etc.

Create a New Layer

When you create a timeline, all events go in the same layer called "Events" though Preceden doesn't display the name of this default layer on your timeline:

You can add a new layer by clicking on the Add Layer link above your timeline: 

As an example, let's add a new layer called "Places I've Worked":

Since we added a second layer, the default layer's name ("Events") is now displayed on the timeline. 

You can change it to something more meaningful by clicking on the layer name on the timeline or by clicking its name in the list below the timeline. Let's change it to "Places I've Lived":

When you have multiple layers on your timeline, you'll be able to specify which layer you want events to be in:

By adding the new event to the "Places I've Worked" layer, it will be grouped separately from the events in the "Places I've Lived" layer:

Reorder Layers

You can reorder layers by clicking on the Reorder Layers link above your timeline: 

You can then click on and drag the layers up or down to reorder them. Be sure to click Update Order when you are finished to save the changes: 

Collapse 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 either checking the Collapsed checkbox while editing a layer, or by hovering over a layer name on the timeline and clicking the up/down arrow beside it:

Note that when a layer is collapsed, the up arrow will always appear besides its name on the timeline that way you can easily tell that it's collapsed.

For expanded layers, you have to hover over the layer name in order to show the down arrow to collapse it.

Collapsed layers are not displayed in PDF and image exports.

Hide and Show Layers

You can hide individual layers by clicking on the layer and then checking the Visibility checkbox.

Be sure to click the Update Layer for it to take effect. To re-show the hidden layer, click on the layer's name in the list below your timeline and uncheck the visibility checkbox.

Layout Customization

By default, every layer uses the same layout as the timeline itself, which  you can set by going to Settings:

Then click on Event Layout: 

You can now customize your layout and have every layer show the events Waterfall style (one event per row) or Collapsed (as many event per row as possible).

However, sometimes you'll want to customize this for certain layers. For example, you could have one layer use the Collapsed layout and another Waterfall. When you create or update a layer, you have the ability to customize its layout style. To update the layer, simply click on the layer name and click the layout option you would like (remember to click Update Layer to save your changes).

Here's an example of a timeline with one collapsed layer and one waterfall layer:

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