This setting will be revealed after enabling the Pie Tooltip toggle. Choose which tooltip type is displayed when the user hovers over a donut chart slice:

• Custom Tooltip: ZoomCharts custom tooltip style will be used for Pie Tooltips. Offers independent configuration from the global Tooltip Settings of this visual.
• Power BI Tooltip: The built-in Power BI tooltip style will be used for Pie Tooltips. Tooltip Settings toggle must be enabled and the Type setting must be “Power BI Tooltip” to properly display this Pie Tooltip Type.