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Stack Aggregation combines a contiguous range of slices — a slab — into a single 2D view. Instead of scrubbing one slice at a time, you see a thickness of data at once, which makes internal features and boundaries easier to locate. Use Stack Aggregation when you want context through the volume: finding a defect that spans several slices, lining up a feature before you lock an Inspection Plane, or reviewing a region before you promote it to full resolution.
When you are cropping an ROI, Deep Slice in 2D is the same idea applied to the crop workflow: each cardinal axis collapses into one 2D image so you can set bounds without scrubbing.

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Working with a slab

Open a Reconstruction or ROI, choose a cardinal 2D view, and expand the view from a single slice into a slab. The Viewport shows the aggregated stack, and you can keep adjusting the slab as you inspect. A slab setup is bookmarkable. Saving a Bookmark stores the slab the same way it stores any other view, so teammates can reopen the same aggregated view.

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Inspection Planes and full-resolution promotion

You can create an Inspection Plane from a slab and take 2D measurements on that locked view. You can also promote a slab to full resolution, the same way you promote a single cardinal slice. Use this when the aggregated view shows a region you want as a high-resolution image for download, Bookmarking, or further review.