The New Sketch refers to a New Sketch Environment with a New UI and Solver. The New Solver comes with New Methodologies and Techniques to fully define sketches which can be very different to classic sketches. The classic sketch is still available but remains a separate environment. While two different environments exist, only one can be enabled at a time per NX session. The New Sketch is enabled using the out of the box defaults unless overridden by a user or a company admin.