1. When I tap the "≡" menu at the bottom left, the menu appears.
2. When I tap stack, the notes are displayed.
3. The notebook in the stack is skipped and the notebook is displayed.
4. I want to see the notebook in the stack.
├ stack
│ └─ noto book (not displayed)
│ └─ noto
├ stack
│ └─ noto book (not displayed)
│ └─ noto