Delete or clear a layer in a notebook.
1. Open a notebook.
2. Tap the button List Form in the top-right hand corner.
3. Tap Layers. Locate the layer that you would like to delete.
4. Tap the button More on the far right.
5. Tap Delete to remove that layer together with its content.
Tap Clear, then This Page Only, to erase content on that layer while keeping that layer remained.