Daily Blender Tip 216: Scaling the interface

Jan van den Hemel writes:
This quick tip shows you a couple of ways to scale the interface of Blender 2.79 and 2.8.

Jan van den Hemel writes:
This quick tip shows you a couple of ways to scale the interface of Blender 2.79 and 2.8.
Does anyone know how to change only the thickness of the lines at the selection edges?