I had a problem with the conventional method of P2V in a VMware vCenter environment which meant that I had to use the Standalone Converter. Once converted I realised that the hard disks were thick provisioned.
As there isn’t a setting to change from thick to thin provisioning the workaround is to migrate and change the datastore location (if you have another datastore available) as this gives you the opportunity to change the format to thin provisioning as part of the migration.
In vCenter right click on the VM and select Migrate
Select Change Datastore
Select a different datastore to the one that the VM is currently located
You then get the option of selecting the Thin Provisioned Format
Once it has completed the migration process follow the same process again to move it back to the original datastore – Migrate then Change Datastore and select Same Format as source
Once completed select the Edit Settings feature of the VM and you will see that the hard disks are now thin provisioned