After you calibrate the axes to move 10.0 mm for a 10.0 mm vector, you can set a Kerf width for the cut layer to compensate for the width of the laser spot:
The offset will apply to all objects in the layer and may give surprising results until you have more experience.
You can also apply inward or outward offsets to specific objects:
The kerf size depends on the beam focus, so run a Focus Test to verify you’ve got the right setting.