You can add a blank chapter to your document in a few different ways:
1. From the document toolbar:
Click the three-dot menu (•••) at the bottom of the canvas
Select “Add new chapter below” from the menu
2. From the mini navigation:
Hover near the edge of the document to reveal the mini navigation
Scroll to where you want to insert the chapter
Right-click the chapter above your desired position
Select “Insert chapter below”
3. From the canvas:
Hover between two chapters or at the end of the last chapter
Click the “+ Blank chapter” button that appears