The vSphere Client does not show the updated list of graphic devices under vCenter Server -> Host -> Hardware -> Graphics.
A GPU was removed from the ESXi host,
vCenter Server 7.x and 8.x
This issue occurs due to a known issue where VC Host Graphics Info cache does not get updated after ESXi Host PowerOff/PowerOn or Maintenance Mode Enter/Exit.
To work around the issue, the ESXi host must be removed from inventory and re-added to get the updated Graphics Device list in the vSphere Client.
This will be fixed in a future release.