Working With Layers
Layers help you 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 lived, one layer for places you've worked, one for your relationships, etc.
Creating 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. For example, lets add a new layer called "Places I've worked":
Because 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:
You can reorder layers by clicking on the "Reorder Layers" link above your timeline.
Hiding and Showing Layers
You can hide individual layers by editing the layer and unchecking the visibility checkbox.
To re-show it, click on the layer's name in the list below your timeline and re-check the visibility checkbox.
Customizing the Layer's Layout
By default, every layer uses the same layout as the timeline itself, which you can set by going to Settings > Events and changing the Layout setting. For example, you can 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.
Here's an example of a timeline with one collapsed layer and one waterfall layer: