Convert to LUKS2

When installing, select the option to install with encryption, this will install Manjaro with LUKS1 encryption. After successful installation, do not restart the system. Instead open a terminal and umount and close the partitions.

umount /dev/mapper/luks-*
cryptsetup close /dev/mapper/luks-*

Then convert both partitions to LUKS2 with

# root
cryptsetup convert --type luks2 /dev/nvmen0p2
# swap
cryptsetup convert --type luks2 /dev/nvmen0p3