There is no exact settings or procedures I can share.
BUT THE SCROLL BAR COLORS might be changed. Let's see if Google can help.
http://stackoverflow.com/questions/35494953/is-there-a-way-to-change-the-style-of-all-scrollbars-win10 DIVES DEEP into where these settings are and notes a tool Winaero Tweaker at http://winaero.com/comment.php?comment.news.1836 to do that if you are scared of the registry.
I know how to adjust screen size and colors etc. The problem is the scroll bar on the right of screen. A friend said that they can't see it. The color is too light. Is there a way of just increasing the shade on the scroll bar. She has a windows 10, not sure of the make of her computer though (sorry). Any help would be appreciated.