I have used bevel, boolean and many modifiers I have forgotten. The problem is the edge and is blue in color. What edge selection is that? I have cleared seams and checked mean crease is 0. So may I know what is this edge select mark in blue and how to remove it?
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$\begingroup$ I got the answer it was sharpen edges $\endgroup$ – atek Dec 20 '16 at 9:15
To fix this follow these steps:
And if you don't want clear sharpness but still don't see blue overlay: in edit mode > properties panel > mesh display > uncheck Sharp.