Why GPARTED showing different partition size than the "df" command?

Question

I'm trying to shrink this /dev/mapper partition, which says has 71 GB available space:

    Filesystem                            Size  Used Avail Use% Mounted on
udev                                  2.1G     0  2.1G   0% /dev
tmpfs                                 413M  656k  412M   1% /run
/dev/mapper/vg-root                   133G   56G   71G  45% /
tmpfs                                 2.1G     0  2.1G   0% /dev/shm
tmpfs                                 5.3M     0  5.3M   0% /run/lock
tmpfs                                 2.1G     0  2.1G   0% /sys/fs/cgroup
/dev/sda1                             495M  494M     0 100% /boot
tmpfs                                 413M     0  413M   0% /run/user/1000

I boot my machine (Ubuntu 18.04 Server) using GPARTED Live CD. But when I open GPARTED, it only says see image below 48 MB is available. It's showing as unmount, but I can't shrink the volume to more than 48 MB. Any ideas why?

Does this answer your question? How can I resize an LVM partition? (i.e: physical volume) — Terrance, Jan 17 '20 at 23:16
Thanks for the reply. I saw this post earlier but what I'm probably confused is why GPARTED gives a different results if compared to the "df" command. — Marc_A, Jan 17 '20 at 23:29
BTW, in your image of gparted the key means that the partition is mounted so you cannot shrink it at that time. — Terrance, Jan 17 '20 at 23:32
Maybe also see: https://superuser.com/questions/917988/gparted-cannot-resize-extended-or-lvm-partition — Terrance, Jan 17 '20 at 23:38
Will check this link. I believe it's already unmounted, since the "Resize" option is there. — Marc_A, Jan 17 '20 at 23:40
gparted may also not be able to actually resize a LVM to smaller because it is reading it there as a whole partition and not looking into the LVM. — Terrance, Jan 17 '20 at 23:42

Why GPARTED showing different partition size than the "df" command?

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