lvreduce -L -100G /dev/mapper/centos-home
Do you really want to reduce centos/home? [y/n]: y
Size of logical volume centos/home changed from <105.12 GiB (26910 extents) to <5.12 GiB (1310 extents).
Logical volume centos/home successfully resized.
Just modify the command above with the -100G to suite how much you want to reduce your volume by.