There is the option to exclude competitors in dashboard widgets and feature charts.  

1. Click on the competitor URL under the chart to deselect it. The competitor will no longer be represented in the chart.  
   

      

1. In Dashboards click on the 3 dots next to a widget chart that includes top competitors to edit the widget settings.
   
2. The right side window will open where a top competitor can be deselected by clicking the X next to it. 
   
3. If you are adding a new competitor to the widget type a domain in the Enter a Domain field.
   
4. Click Update in the top right corner to update the filters on the widget.
   
5. Note that using the Update button will not save the new filter settings as defaults on the widget. The dashboard will need to be in edit mode to save changes to the widget filters in the dashboard. Learn more

How To Update Competitors In Dashboard Widgets Video