Constraints are essential tools that define geometric relationships between sketch elements on the same plane, providing precise control over their behavior. In Shapr3D, Constraints helps maintain these relationships, allowing you to dictate how sketch elements respond to modifications. For example, you can add a Horizontal/Vertical constraint to a line to ensure it remains aligned with the axes of the sketch plane.
When working in a sketch, valid constraints for selected elements are highlighted in the constraints menu. You can also choose to have constraints created automatically for you while sketching by adjusting options in Constraint Settings.