Too Many Edges
Working with tangent edges can cause the graphic area to get a little confusing. You have a bunch of edges on your model and maybe you don’t know what they are. You can always turn “Shaded with Edges” off but if you’re like me, I like to see the model edges. Well here’s an option that you might not know about; Part/Assembly tangent edge display.
This option allows you to show, set as phantom, or remove tangent edges. This helps “clean-up” your graphics area.
Go to “Tools>Options>System Options>Display/Selection>Part/Assembly tangent edge display” to turn the option on.
Go from this: To this: