Modify Geometrical Constraints - Parametric Design

Objects that are constrained can still be modified by grips
Activate the grip, you can stretch, move, rotate, scale

Press Shift key once after activate the grip, you can change the vertex

Press Shift key one more time, cycle back to stretch in X and Y direction

Constraints automatically deleted after you modify the grip location

Delete Constraints

Right-click on the constraint, select Delete