Expanding a LUKS drive

First make sure that the drive is opened and mounted.

Run the commands

sudo cryptsetup resize [Drive]
sudo resize2fs /dev/mapper/[Drive]

To find out what [Drive] is supposed to be, examine the following commands output

sudo lsblk

In the following example it would be crypt-sdf

NAME          MAJ:MIN RM SIZE RO TYPE  MOUNTPOINT
nvme0n1       259:1    0  20G  0 disk
├─nvme0n1p1   259:2    0  20G  0 part  /
└─nvme0n1p128 259:3    0   1M  0 part
nvme1n1       259:0    0  50G  0 disk
└─crypt-sdf   253:0    0  30G  0 crypt /mnt/sda