Edit a Timeline's Settings

To change a timeline's title, initial focus date, and zoom level (or to delete it), click on the green options button (shown enlarged) to the right of the timeline title on the timelines panel.

On the bottom of the brown options panel that comes up, there is an orange "edit timeline settings" button.

This should bring up a menu that looks like this:

See the details for each field at Creating Timelines

Make changes, and then hit the "enter" button.