On the Desktop Studio, there is a menu for adding additional storage but no option for removing the storage once it is configured.
However, there is a PowerShell cmdlet Remove-HypHostingUnitStorage that can be used for removing the existing Storage
The below is how my datastore connections look like and I am going to demo removing one of the existing connections VNX-Templates
Open PowerShell in Admin mode and run the below commands one after the other
Look for the below marked text in the output for ls command
Run the below to delete the datastore
Remove-HypHostingUnitStorage -LiteralPath ‘XDHyp:\HostingUnits\DataStore – Hosted Shared Desktops’ -StoragePath ‘XDHyp:\Connections\MCSforXD\Mt Albert.datacenter\Production.cluster\VNX-Templates.storage’
Wait for the command to complete. once done, refresh the Studio and you will notice that the datastore has been removed.
Citrix themselves also has got a KB out for doing the same and there are some pretty disclaimers and warning before you attempt to do this. http://support.citrix.com/article/CTX131207