Auto dimming mirror

The auto dimming mirror on Focus is too sensitive. Even correctly adjusted dipped headlamps will significantly darken it. Can it be adjusted?
I am considering partially covering the sensor with paper or something.

  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.