In order to achieve this you have to modify RadPivotFieldList template and particularly OperatorValueFilterControlStyle - you can remove the Checkbox from it. RadPivotFieldList doesn't have an event similar to RadGridView. You can log this feature request in our feedback portal
and we'll consider adding it to our backlog if there is high customer demand.
Hope this helps. Feel free to contact us in case you have any problems or concerns.
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