expanding drive

I am new to Parallels. I've setup a new Win 11 machine and I started with a 256G virtual disk. After a couple of days of installing and copying files, I then expanded it to 512G (using Parallels Hardware for the VM). I've just gotten a message in Windows that I'm running out of disk space...

I have some VMs that balloon over time to consume terabytes of disk space, even though at the core, they are only a 60 to 150 GB. Some process causes runaway growth to the point that the VM consumes all the space on the physical drive it it hosted on, bring all the VMs on that drive to a stop...