Hello, Raj,

I assume that you are referring to the built-in checkbox filtering so see my comments below:

1) filter should be excel kind of filter

We cannot change the current behaviour of the grid with multi checkbox filtering as that would cause a breaking change for others. However, if this item gains more popularity, we can add an option which will allow you to enable excelLikeFilter:true for example. Meanwhile, use this knowledge base article to achieve it: https://docs.telerik.com/kendo-ui/knowledge-base/grid-with-excel-like-filter

2) should be sorted

You can use this article to implement it:

https://docs.telerik.com/kendo-ui/knowledge-base/sort-multi-checkbox-filter

3). remove duplicates in filter options

This is already the built-in behaviour: https://dojo.telerik.com/@bubblemaster/UMiheXaX

Kind Regards,
Alex Hajigeorgieva
Progress Telerik