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Sheets.OutlineColumn.IOutlineColumnOptions
• Optional collapseIndicator: string
The collapse indicator (url or base64Image).
• Optional columnIndex: number
OutlineColumn index.
• Optional expandIndicator: string
The expand indicator (url or base64Image).
• Optional images: string[]
The images by level (url or base64Image).
• Optional maxLevel: number
When the current row level is greater than maxLevel, the IncreaseCellIndent action does not take effect.
• Optional showCheckBox: boolean
Whether to display the check box.
• Optional showImage: boolean
Whether to display images.
• Optional showIndicator: boolean
Whether to display the indicator.