In order for the RadLegend element to display correctly in the provided project, a new instance of the DataPointLegendSettings settings would need to be set for the LegendSettingsproperty of the BarSeries. On the mentioned data point settings, it is important to set the TitleBinding property to the CategoryBinding property's value of the used bar series. The following code snippet shows this logic included into the used series:
Please keep in mind that the DataPointLegendSettings is only supported by the BarSeries and the BubbleSeries. Otherwise, you should use SeriesLegendSettings.
With that said, I have modified the sample project for you to test, so, could you give it a try?
Virtual Classroom, the free self-paced technical training that gets you up to speed with Telerik and Kendo UI products quickly just got a fresh new look + new and improved content including a brand new Blazor course! Check it out at https://learn.telerik.com/.