I did a bit of searching and couldn't find this in the documentation. Is there a way to change the text in the ComboBox dropdown when there is no data in the source collection?
That said, I can understand how making this customizable per component instance could be useful, so I made the following enhancement idea page in our portal where you can track the implementation of a no-data template so you can put your own content there instead: https://feedback.telerik.com/blazor/1477531-no-data-template-in-the-combobox.