Show 3D alignment lines
Use the 3D Sketching tab→3D IntelliSketch group→Show 3D Alignment Lines command 
as a visual assistant when drawing in 3D space. The alignment lines attach to the cursor. The red line represents the X direction, the green line represents the Y direction, and the blue line represents the Z direction.
When drawing a line, if the second point of the line lies on one of the alignment lines, a parallel icon 
is displayed to indicate that it is aligned in that direction. Also the alignment axis is highlighted on the orientation triad.
If a plane is locked 
, only horizontal and vertical alignment lines are displayed.
If you do not click an alignment line, the point goes on a plane normal to the view.
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