Thank you for the provided image and code.
The default position of the series labels in RadChart for Xamarin is left. In order to change the position of the labels to be top (center) you will need to implement a custom renderer for UWP. I have prepared a sample example with all changes applied. Please take a look at the CustomCartesianChartRenderer.cs file inside the UWP project from the attached sample. The data labels position is set to top (center).
Let me know if you have any other questions on this.
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