Selecting View - View Subsections opens the subsection viewer which displays the subsectioning of your circuit. You may view all metalization levels and their subsectioning.
For a discussion of subsectioning, see the Introduction to Sonnet meshing (subsectioning) in Important Modeling Concepts.
The subsection viewer is essentially a limited version of the current density viewer.
NOTE: Please note that for a thick metal via, the via is displayed on all the levels it traverses, including the top level when vias are visible.