Currently, the columns of the MultiColumnComboBox do not support built-in functionalities for user manipulation like sorting, resizing, etc., similar to the Grid component for example. The only available approach for achieving this is by implementing a Grid component in the popup of a ComboBox component through a template:

• https://stackblitz.com/edit/angular-v8mywa-6xesq3 

Please provide the ability to sort, resize, etc. the columns of the MultiColumnComboBox.