As far as I can see, there is no way to style the disabled input in older versions of IE ( this is default browser limitation, it affects any HTML input, and is not related to Webix code )
You can try to disable not the control, but the parent layout instead
Thanks for the update, but I do not want to make the label as Red, but I want to make the color of Selected Data (Banana) in Bold and in Black color in disabled rich select