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 button 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:
You can reorder layers by clicking on the Layer Name in the timeline to open the Update Layer dialog:
You can then click on and drag the layers up or down to reorder them. Be sure to click Update Layer when you are finished to save the changes:
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 are 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, you should use the Hide Layer feature (see below).
Hide Event Details
Preceden will normally determine whether to show event dates and durations for events in this layer based on what you select in the Event Details section of the timeline appearance settings. You can modify the visibility of dates and durations in the Content Visibility section of the layer options to override those settings and always hide those details in this layer.
This gives you the ability to show those details in some layers but not others:
You can hide individual layers by clicking on the layer and then checking the Hide this layer checkbox in the Content Visibility section.
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 this option.