Constraints dictate how geometry behaves. A fully constrained sketch turns GREEN. An under-constrained sketch remains WHITE. Over-constrained sketches turn PURPLE or RED.
The Sketch Tools toolbar is dynamic; it changes based on the command you are currently using. It usually appears at the bottom right of the screen. It allows for precise input of coordinates and values without constantly clicking the mouse. catia+v5+sketch+tools
These tools help manage the visual complexity of the sketch. Constraints dictate how geometry behaves