When you draw with a 3D sketch in 3D, you can divide the window into two or four. In particular, it makes your work easier if you draw with a Spline and manipulation is a bit difficult. Additionally, by right-clicking on a Spline point, you can enable the Show sketchbook triad option, which makes it easier to move such a point. Splitting the window results in this, that by grabbing the spline handle....
