When you enable automated subdivision for a shopping campaign, you can specify email addresses that Search Ads 360 notifies when it subdivides a product group or removes an auto-generated product group.
In addition, you can see a list of all auto-generated product groups in the Auto generated column on the Targets: Product groups tab.
If you don't want to keep a subdivision, you can remove it. However, Search Ads 360 may regenerate the subdivision later if products in the group continue to exhibit unique performance characteristics.