There is a need for configuring how the Breadcrumb items will be collapsed. 

• First and last items will be always visible.
  
• The component will allow a min-width option to be set.
  
• The component will provide a collapseMode property with the following option 'auto' | 'wrap' | 'none'
  
  • 'auto' - if the component does not fit inside its container, collapse left-most visible item which is not the first or last item.
    
  • 'wrap' - if the component does not fit inside its container, wrap its contents on two or more lines.
    
  • 'none' - do nothing if the component does not fit inside its container. This would be useful if some kind of scrolling needs to be implemented by the developer.

The defaults for showIcon and showText are undocumented at https://docs.telerik.com/kendo-ui/api/javascript/ui/breadcrumb/configuration/items.showicon and https://docs.telerik.com/kendo-ui/api/javascript/ui/breadcrumb/configuration/items.showtext respectively.

I understand they are true and false respectively when type is "rootitem" and the opposite otherwise.

More sensible defaults would be along the lines of:

showIcon = !!icon