I am using the curvature tool and setting the stroke to 10 pt. But the line appears to be as thin as possible. Even if I change the color of the stroke, it is not seen. All the characteristics- the width and the color- appear only when I double click on the object and enter the Isolation Mode. I am using Adobe Illustrator CC2017. However, this problem is only seen in this file and it was not there earlier as well. Is there a setting I might have enabled by mistake? How to fix this?