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I removed a couple of other VMs but the Free PE is still 0.
$ sudo vgdisplay --- Volume group --- VG Name qubes_dom0 System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 27755 VG Access read/write VG Status resizable MAX LV 0 Cur LV 82 Open LV 14 Max PV 0 Cur PV 1 Act PV 1 VG Size 237.47 GiB PE Size 4.00 MiB Total PE 60792 Alloc PE / Size 60792 / 237.47 GiB Free PE / Size 0 / 0 VG UUID 007hBk-o2Kx-OdMy-970q-g5v7-mWxc-lMi29y
In the Qubes UI (top right corner), clicking the disk icon, it shows 46.8% disk usage (it was over 50% before I removed these VMs).