If you don’t want to keep the virtual machines and related data on your Mac, you can delete them before you uninstall Parallels Desktop. Here’s how you can do to remove virtual machines: Right click on Parallels Desktop icon in Dock and choose Control Center. Parallels Desktop for Mac Home Edition; Parallels Desktop for Mac Pro Edition.
In Parallels Desktop
To remove a virtual machine (VM) please follow these steps:
Parallels Desktop For Mac Pro
Launch Parallels Desktop.app, but do not start your virtual machine.
Click on the Parallels icon on the Mac menu bar > select Control Center.
Right-click on your virtual machine and select Remove.
Select Keep files if you wish to access the files from this virtual machine later. The virtual machine will be removed from the list, but it will remain in its original location.
Select Move to Trash, if you do not need any data from this virtual machine and want to erase it completely.
WARNING: The Move to Trash operation is irreversible. After moving the VM to Trash you might not be able to restore it.
Parallels 11 For Mac Uninstall
In Finder
If you have already deleted Parallels Desktop from your Mac, see KB 117333 for instructions to locate the VM on your Mac and then move it to Trash.
Parallels 11 For Mac Uninstaller
Restore a virtual machine
Parallels 11 For Mac Uninstall Java
To know how to remove a virtual machine from Parallels Desktop but to keep its files for future use, please read this blog post: How to Remove a VM…and Bring It Back Again.