Merge a layer downward 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 it to disappear while moving all its content down one layer. 
4. Tap the button More on the far right. 
5. Tap Merge Down. That layer will be deleted, but its content is merged with the layer below it.