Hi Old Forge
As Ashok says, the option to turn pop-up labels on and off is in the presentation tab. You can also set an expression as a pop up label, just like you can in any other chart.
If you create a second expression that evaluates to a text string, and tick the "text as pop up" box under the display options, this will not be evaluated as a value but will pop up instead when you hover over the chart.
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