convert lvm to thin

Hi, I install proxmox and my first storage is LVM-Thin but my second storage is LVM. I need all of my storage is LVM-Thin mode,I have many search but I don't find solution. I test this link (https://pve.proxmox.com/wiki/Storage:_LVM_Thin) but for create VM I don't finde this LVM-Thin 100GB to...