Below are the logical steps to reduce the size of the LVM partition:
Unmount the file system using the unmount command
Use the resize2fs command as follows:
resize2fs /dev/mapper/myvg-mylv 10G
Then, use the lvreduce command as follows:
lvreduce -L 10G /dev/mapper/myvg-mylv
This way, we can reduce the size of the LVM partition and fix the size of the file system to 10 GB.