I want to convert all small circle into construction circle. For that I tried to use selection box to select the circles. But I found that inside this gray color region selection box is not active. Does anyone have this experience?
Looks like you are correct Maha. With the Shaded Sketch Contours on you can not start your selection box in the shaded area. You can toggle that on and off with the Shaded Sketch Contours tool. Turn it off prior to making your selection. I have the icon on my sketch tool bar but you can probably add it to a mouse gesture if you do this frequently. Or maybe a hot key. The shaded sketch contour does have many advantages but I don't always want it on. I believe in 2018 you will be able to begin your box on the shaded portion. I'm going to have to try it.
Thanks for the explanation.
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