The ShowDistinctFilters indicates whether the user will see the distinct values in the filtering control or not.
When it is set to false, then only the down half of the filtering control will be used for filtering. I have attached an image to illustrate that.
We would update the help documentation if you are more specific and suggest us what kind of information would be helpful to be there.
As to your requirement, do you need a filtering control like the one shown in this online demo?
All the best,
the Telerik team
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