Vvols Disk extend option is grayout in standalone VM

[Saj29]

Hello Team,

I have a single virtual server that contains all VVOls discs and a paravirtual SCSI adapter is enabled

The server is a standalone server, and when I attempt to increase disc space on a virtual volume disc, the choice is greyed out.

All disks are in thin size. request you to please suggest 

Thanks 

[a_p_]

In most cases this is caused by the VM running on snapshots.
In order to be able to resize a virtual disk, the VM must not have snapshots.

André