Parallels Desktop has a nifty feature, whereby it can automatically start a VM (virtual machine) automatically run whenever the VM is opened.

It has a somewhat less useful feature whereby VMs automatically close when stopped.

Parallels has a flaw and bug that a) you cannot even view the VM configuration when it's running, and b) when you try it generates an error, but not an option to stop the VM and edit.

The workaround (from Parallels' Help) is start Parallels and hold the Command key down when opening the VM. This circumvents the auto-start feature so you can configure the VM.

A better solution would be to a) let you pause a running VM and view its configuration in read-only mode, and b) if you try to edit, then offer to stop the VM and continue.