In comparison to the rich data I can see in Customer->customer administration in Magento 1.8 the new M2.3 offers only very few fields to view in Customer-> all customer. So I find no way to see all customer data including his orders, adresses, wishlists, .... Also handbook does not help.
Where is all that functionality gone to?
Is there and extension that covers that?
Here a comparison from 1.8 screenshot