How to reduce root Volume Group size in LVM?

I found a similar question here, but there's one different point on my server: --- Volume group --- VG Name vg System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 4 VG Access read/write VG Status resizable MAX LV 0 Cur LV 3 Open LV 3 Max PV 0 Cur PV 1 Act PV 1 VG Size 465.50 GiB PE Size 32.00 MiB Total PE 14896 Alloc PE / Size 14896 / 465.50 GiB Free PE / Size 0 / 0 VG UUID xxxxx pvdisplay --- Physical volume --- PV Name /dev/sda3 VG Name vg PV Size 465.51 GiB / not usable 15.00 MiB Allocatable yes (but full) PE Size 32.00 MiB Total PE 14896 Free PE 0 Allocated PE 14896 PV UUID xxxxx I would like to install virtualizor on the server and using volume group storage configuration, but with this preinstalled OS configuration (volume group root) it is not possible and my skills are not enough to know how to do to shrink the volume group and create a new one.