Understanding VM storage, and adding partition to VM

I have a new cluster, one node - 4TB drive, default install. One VM, with 32G of storage.

Question 1: Where, really, is the 32G of data?
Based on https://opensource.com/business/16/9/linux-users-guide-lvm, I think it's...
4TB drive -> GPT layout -> 3rd partition -> LVM -> default 'pve' volume group -> ??? -> LV 'vm-100-disk-0' from lvdisplay?

Question 2: I get the idea of LVM thin - overprovision by only provisioning blocks as they are used. I can see (pvesm lvmthinscan pve) that I...

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