I have the pro version but I still notice "Uncategorized" next to items
After purchasing the Advanced Database Cleaner and installing it, you will still see "Uncategorized" next to each item:
To categorize items and see to which plugins/themes they belong, click on the "Scan" button:
Or, you can separately select the items to want to categorize, then select "Categorize selected items" under "Bulk Actions" and click "Apply":