How to move workspace on a Jenkins slave

My Jenkins slave is a windows box. The jenkins installation is of course located on the C drive, and I’m running out of space. I was able to get a larger drive attached, which I want to move the workspace to. Seems simple enough, but its not going as planned. It looks like I can simply update the config.xml file. Which I did, stopped the jenkins agent service, copied workspace to new drive and restarted service. That didn’t change anything and Jenkins just rebuilt the workspace back into the install directory on the C drive. I’ve looked through all of the config files hoping to find something obvious, but no luck. I also tried on the master, going to “configure nodes” and putting the workspace in the custom workspace field. Which i thought worked, but all it did was put some remoting files in the workspace directory. Anyone happen to have some experience with this?