[gcr]

In Fusion 360, you can drag underconstrained parts of the sketch around with the mouse. So the “degree of freedom” is still specified, but by accidental placement of how you drew the sketch. Fully-constrained sketches show a black outline and can’t be changed without explicitly editing a constraint or dimension.

For a quick example, see slide 10 in https://docs.google.com/presentation/d/1TiVoKF7mLlF360Oxy8hN... This is just a quick doc I made to show a friend how to use Fusion 360.