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It doesn't make any sense that you use lvremove and vgdisplay shows zero free. How are you deleting logical volumes? Do you have multiple PVs? Try pvdisplay and lvs
Here is vgdisplay output again:
$ sudo vgdisplay
  --- Volume group ---
  VG Name               qubes_dom0
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  28134
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                95
  Open LV               29
  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
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What is PV?
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sudo lvs does not show the deleted LV/VMs. UI disk usage (top right corner) shows empty disk as well (the space got released).
I deleted the LVs using the command you adviced (sudo lvremove /dev/qubes_dom0/vm-whonix-gw-15-root.tick etc).
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