Alternatively: Is there any other GUI that can edit the size of the inner LVM partitions? I’ve tried gnome-disks, gparted and blivet. Gparted does only recognize the disks and GNOME disks does not help either.
I want to avoid using the command line for this. People say LVM has resizable partitions… they claim, at least. I did not see it so far…
I notice the same issue. My first thought is that the volume needs to be unmounted before resizing. I tried it, and unmounting makes “Format” and “Set label” available, but still “Resize” remains greyed out.
I used the current version in Fedora 31 which is blivet-gui v2.1.12.
Yes, your steps with a live CD should work, but that does not explain why it doesn’t work while the OS on the drive is booted. I believe I did previously resize an LVM volume with blivet-gui while booted, but it was a long time ago so I’m not 100% sure anymore.