You can check it out on the Telerik Demo. (Menu name: MultiColumnComboBox => See 'Content:Products'.)
+ The format of the dropdown is a grid view, but you can customize it and set it to display only checkbox and name.
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Dinko | Tech Support Engineer
Telerik team
answered on 12 Jul 2021, 10:23 AM
Hello Kai,
Thank you for the provided image.
The RadComboBox control does not support such functionality for its selected items. As KIM mentioned in his reply, you could consider using RadMultiColumnComboBox control and modify the grid inside the drop-down.