Fix Direction

1. Select a line.
2. Select the context-sensitive function Constraints > Fix Direction.

When you are drawing a line in a sketch by using the cursor direction lock, the software sets a direction constraint to the line. An arrow next to a line drawn in for example 45° or 135° symbolizes the constraint.

You can prevent the cursor from snapping in the direction of the ruler by pressing the Alt key, for example when drawing a line.