What is the function of Snap Primitives

In the IC mode, how to use the snap primitives option.

In the IC mode, there will be layers known as Signal layers. If you select any of these layers, or just a few structures on them, and click Snap Primitives, HFSS will change the cross-section of some of them  to align with the adjacent structures, provided that the delta is smaller than what was specified in the setting.