SolidWorks Filters: Users often turn on filters without intending to do so, why?
This usually happens when we type new names for features in the Feature Manager Tree.
The SolidWorks' graphics area can become active if you bumped the touch pad or mouse stick on your laptop. The letter "e" is a shortcut (in the graphics area) to filter for edges and this turns on the blue funnel on our cursor. It also makes it impossible to select a model face to start a sketch.
Checkout the following video to see how it works: