Information can be stored on different layers of a PDF. You can view, navigate, and print layered content in PDFs created in third-party apps.
You can control the display of layers. Use the Layers pane to examine layers and show or hide the content associated with each layer.
The eye icon indicates a displayed layer. When the eye icon is crossed, the layer is hidden. You can set the initial visibility state of the layer to 'shown' or 'hidden' when a document is first opened.
To set or change the default state, tap on the eye icon.
You can also expand or collapse all layers by:
1. Tapping on Layers.
2. Tapping on Options.