you need to now expand the file system. it's just some simple commands, but could vary a bit from your system.

run lsblk see your device name

then run something like sudo parted /dev/sda

you might need to run sudo pvresize/dev/sda2

and expand the logical volume sudo lvextend -l +100%FREE /dev/vg0/root

and resize the system sudo resize2fs /dev/vg0/root

to be honest your best bet is to take all of your information and what i just gave you and go to chatgpt.com and say something like "i cloned a 1 tb drive onto a 2 tb drive and im still seeing the 1 tb file system size and not the 2 tb size. what linux commands do i need to run to use the full 2tb size of my new drive" and follow those instructions. copy and paste what you get as output back into chatgpt to troubleshoot, etc.

let me know if you have any issues.