Keyboard Shortcuts
- Alt + ←↑↓→: Move node
- Ctrl + ↑↓: Move focus (All nodes)
- Ctrl + Shift + ↑↓: Move focus (Siblings)
- Enter / Ctrl + Backsp: Add / Delete
- Tab / Shift + Tab: Indent / Outdent
- Alt + .: Expand / Collapse
- Alt + Cmd + .: Expand All (Recursive)
- Alt + Shift + .: Index View (1-level only)

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Toggle Button (+/=)
- Click: Expand / Collapse
- Ctrl + Click: Expand All (Recursive)
- Shift + Click: Index View (1-level only)