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A horizontal constraint is inferred if you are drawing a line and drag your
mouse such that the line is parallel to the X-axis of the Sketch Plane. It is
indicated by a horizontal red line symbol.
Another kind of horizontal constraint can be inferred by touching a
point and moving the mouse in a horizontal direction. You will see a white
line stretching from the touched (referenced) point to your current
mouse position. This means that the point that your command is in the
process of defining is constrained to have the same X-axis value as your
touched point.
Vertical Constraint Inference (4):
Sketch | 167