On the NVME drive, the LVM2 member is not directly mountable, so won't display in Files. You will need to make a volume group (VG) containing p2, and then a logical volume (LV) in that volume group which can then be formatted ext4. After that, the file manager will show the ext4 file system that was created in the "Other Locations".
To do these tasks, you need to understand LVM concepts and LVM commands, which requires some study on your part if you don't already know how.
Here is the same setup on this computer, but with two logical volumes added, each formatted ext4 and with an OS installed on it:
Code:
nvme0n1
├─nvme0n1p1 vfat
└─nvme0n1p2 LVM2_member
├─wdsn500-manjaro--nvme ext4
└─wdsn500-ubuntu_1904 ext4
There are many tutorials and articles about LVM on the web, but here are two I used to learn about LVM several years ago:
Ubuntu LVM Guide
It's a bit old, but the commands haven't changed. Ignore any references to the GUI tool mentioned, as it's no longer available and you don't need it.
Also read and study this article:
LVM Demystified
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