This question duplicates your other thread regarding the same matter. It is converted to a support ticket and you can find it in your Telerik account.
For the sake of the community, I have to say that the filtering of the RadMultiColumnComboBox
is performed depending on the inputted text, even if it is Arabic. As long as you have an item in the control to match the text you have entered it would be filtered.
I would like to also ask you to use a single channel for contacting us. Duplicating questions might slow our response time, in case you have an urgent matter please use the ticketing system which is handled with a greater priority compared to the forums.
Thank you for understanding.