There are six criteria, all of which must be met, before a group of vias in the original geometry is considered an array and therefore simplified by the software.
Number of Vias: There must be a minimum number of vias in order for them to be considered an array.
Via Size: The vias must be the same size or nearly the same size.
Via Spacing: The vias must be within a certain distance of one another.
Layer Pass Through: The vias must pass through the same layer(s).
Metal Polygons Pads: The vias must be contained within the same metal polygon at either the top or the bottom of the vias.
Material: The vias must be set to the same material, whose conductivity is the same.