The following null reference exception occurs inside the CanLoadMoreItems method
Object reference not set to an instance of an object
at Telerik.Maui.Controls.DataGrid.GridModel.CanLoadMoreItems()
at Telerik.Maui.Controls.DataGrid.GridModel.MeasureCells(RadSize availableSize)
at Telerik.Maui.Controls.DataGrid.DataGridContentLayout.Measure(Double widthConstraint, Double heightConstraint)
at Microsoft.Maui.Platform.MauiPanel.MeasureOverride(Size availableSize)
at ABI.Microsoft.UI.Xaml.IFrameworkElementOverrides.Do_Abi_MeasureOverride_0(IntPtr thisPtr, Size availableSize, Size* result)
For the distinct values, there is a bool property that allows you to hide the distinct values: ShowDistinctValuesFilter.
Expose similar way for the Show Rows with Values options