You have a design form www.shopcreativevector.com but the material is different than 3mm or you want to cut the design in a different scale.
Change the scale to make the design fit your material and if you want a larger or smaller size.
Using the example of the Lightburn program. Simple steps.
1. Close the padlock next to the 100% scale
2. Select all vectors
3. Enter the new scale value according to the table
And that's it.
Enjoy a larger design for thicker material or a smaller one for thinner material.