## Animation

- Folder 1
  - Folder 1.1
    - Folder 1.1.1
    - Folder 1.1.2
    - Folder 1.1.3
    - Folder 1.1.4
  - Folder 1.2
  - Folder 1.3
  - Folder 1.4
- Folder 2
  - Folder 2.1
  - Folder 2.2
  - Folder 2.3
  - Folder 2.4
  - Folder 2.5

Expand Animation
Collapse Animation
You can add and expand animations by setting the expandAnimation option to an effect and a duration, and you can add a collapseAnimation option by setting the collapseAnimation property.